Imprezive Motorsport Performance Exhaust

DaveU · 16-06-2003, 07:05

Hi All,

As you may or may not know my vRS has been down at Hayward & Scott for the last week under the watchful eye of Mr Disco (John) having a new full system developed exclusively for Imprezive Motorsport.

The system is complete replacement and runs from downpipe to tailpipe.

Downpipe:
2.5" Drops straight down and makes its way under car replacing cats. 2 existing sensors are tapped back into pipe.

Mid Section:
2.5" gentle flowing bends into

End Bit: (technical aren't i :p )
2.5" into handmade backbox which then splits depending on choice of finish (double welded) - I went for twin 3" as that's what I like, other options include the same twin 3s but slash cut or you could have an oval.

When looking at the original system (see photos in following posts) it is incredibly overcomplicated and has uneccesary bends+rightangles all over the place. This new system as you can see is far superior with minimal bends with minimal angles.

Sound:
It's a lovely deep burble It seems to have 3 styles:

1) Feathering throttle/pootling around
Surprisingly refined actually - you can tell it's there but its not intrusive.

2) Pressing on
Now it gets interesting! All of a suddenly you hear the mechanical whir of the turbo spinning up followed by what can only be described as (and i've been trying to think all weekend of something similar) a fantastic Cosworth type sound on acceleration. Back off and you get pops and bangs from the backbox

3) Absolutely flat out
Well now it just gets silly! If you really punch it you are rewarded with a serious roar! It's quite addictive really

Performance:
Obviously i'm still overly excited but I reckon this is the type of exhaust they should put on all performance cars. All the popping and turbo type noises you can now hear and feel make you much closer to the car and what it is doing.
Where-as before if you wanted to explore the upper end of the speedo you would need quite a reasonable stretch of road, you now don't! You can go from a standing start and just hammer straight through all the gears: 1st, redline into 2nd, redline into 3rd, redline into 4th and redline into 5th. It pulls like a train with no effort - I went past 140 before an inconsiderate corner required me to back off, i've never hit those speeds before on that stretch of (private

) road.
Mid range and in gear response times are improved as well with quicker spool up. The car now feels like it has been woken up.

Oh - and no CEL either - and that's without the ECU fix which is just around the corner!

So, all in all? Very Imprezive

DaveU · 16-06-2003, 07:05

This is the new downpipe fitted:

DaveU · 16-06-2003, 07:06

oops

DaveU · 16-06-2003, 07:08

This is the mid section:

DaveU · 16-06-2003, 07:09

Backbox:

DaveU · 16-06-2003, 07:11

This is the OEM downpipe - note the uneccesary bends and changes in bore all over the place - what were the vw/audi boys thinking when they created this?

llblake · 16-06-2003, 07:35

Sounds and looks like another satisified H&S customer!! I am still very happy with the rear box that H&S fitted to my RS. I would recommend them to anyone who is looking at replacing the standard RS exshaust system.

Lloyd

**TaviaRS** · 16-06-2003, 07:40

Hopefully mine will be done this Saturday

I'm going for the oval as its more like standard but I may keep the hi-flow cat in mine.

Glad you like it Dave, all you need now is a front mount, a remap, a brake upgrade and some decent suspension

DaveU · 16-06-2003, 07:59

Quote:

Originally posted by TaviaRS in this post
Glad you like it Dave, all you need now is a front mount, a remap, a brake upgrade and some decent suspension

<sighs> it's a slippery slope which i'm well on the way to going down

**TaviaRS** · 16-06-2003, 08:05

**mannyo** · 16-06-2003, 08:21

Dave, really nice job. Looks good.

Jon, fancy selling me your old miltek.

fen_l&k · 16-06-2003, 08:30

Looks v. cool. Ahh, us TDi owners can only dream of such things.

Could poor downpipe design be VAG's equivalent of Microsoft - got to leave room for after market guys to do a better job??

For the abbreviationally-challenged, what's a CEL???

Howard

**TaviaRS** · 16-06-2003, 08:43

Check Engine Light

Manny, full system or just cat back? If its cat back, PM me.

Jon

SkodiRS · 16-06-2003, 08:51

Dave,

you have PM.

Cheers.
Adrian.

Quinten · 16-06-2003, 09:01

Will this custom exhaust (not too familiar with all the terms) fail the emissions test? Or did I misread it and it does still have the cat fitted?

Q.

Quinten · 16-06-2003, 09:01

Oh, and whats the price like? Comparable to the Militek? Or better?

**TaviaRS** · 16-06-2003, 09:02

It will fail an emissions test. You need at least a 200CPI (cells per inch) CAT to pass IIRC, hence me probably keeping the free flow cat I have in place.

Jon

**TaviaRS** · 16-06-2003, 09:03

Cheaper than Milltek, mainly because it has no CAT. With cat I think its a comparable price but I'm prepared to be corrected by Disco (John).

redbaron · 16-06-2003, 09:20

whats the performance like in comparison to the milltek?

as you know ive just had mine on with hi flow cats and big bore down pipe...

i didnt feel the difference as much as i thought I would - having said that I absolutely destroyed a tt 225 on my private drag strip.

ckosm · 16-06-2003, 10:06

Quote:

...
The system is complete replacement and runs from downpipe to tailpipe.

Downpipe:
2.5" Drops straight down and makes its way under car replacing cats. 2 existing sensors are tapped back into pipe.

Mid Section:
2.5" gentle flowing bends into

End Bit: (technical aren't i :p )
2.5" into handmade backbox which then splits depending on choice of finish (double welded) - I went for twin 3" as that's what I like, other options include the same twin 3s but slash cut or you could have an oval.

When looking at the original system (see photos in following posts) it is incredibly overcomplicated and has uneccesary bends+rightangles all over the place. This new system as you can see is far superior with minimal bends with minimal angles.

DaveU,

Do you have any dyno tests from other people to see exactly what the gains are? Is your RS a chipped one or stock?

I would rather say that with a cat-back system you have some power gains at about 4-5%, but if you add a larger down-pipe+race cat you cause much more turbo boost raising (by significantly reducing back-pressure), and the ECU is always there to drop turbo pressure at the spefified levels. In other words in order to get any gains from a down-pipe + race cat you need to do that with re-programming/re-mapping the ECU... Is that right or I am wrong?

Disco@Impreziv · 16-06-2003, 12:03

Phew, I have been looking forward to this post Dave, albeit with 'nervous' anticipation

I take it as read, that you consumed rather a lot of petrol enjoying and testing the system this weekend?

With regard to theoretical performance with/without a remap:

Without: All turbos require a degree of backpressure to assist in spool up. But none except dustbin sized ones require it to be as sufficient as the back pressure generated by standard exhausts on almost every performance car. The now considerably freer flowing exhaust aids/increases turbo spool up by allowing the combustion to flow quicker and therefore quicker thru the turbo itself. This means that low down spool up is quicker, and also mid-range turbo is vastly improved as the engine can reintroduce the turbo quicker. The ECU will obviously control boost limits etc to that of standard, however low down the car will be able to hit its boost targets earlier which is where the power gains come from. Power is not dictated by boost alone.

With: With relation to exhaust alone, the main benefits of adding a remap to the system is that you can a ) Improve the power gains by adjusting other parameters to deal more effectively with the altered flow characteristics and b) if you want you can increase the boost/turbo pressure and deal with the extra combustion more efficiently.

Interms of cost, it will work out cheaper (slightly) than a full Milltek, however I'm trying to work out some prices now. The production cost is/was fairly high but I dont want to pass too much on and make it unsellable.

9 times out of 10 it will probably fail emissions test on an MOT, so you'll need to find a friendly MOT station

, but if you consider how many Cosworths and Subarus etc out there mostly running decats, you'll realise there are plenty about.
Officially this is sold for off road use

Anyway glad you like it Dave, sounds like its pretty much everything you were after?

SkodiRS · 16-06-2003, 12:10

Q,

it will fail the MOT.....

Doh! Didn't go tot the next page.:o

Quinten · 16-06-2003, 12:20

So, what you're saying is that it will fail its MOT yeah?

:p

Guess it's only for the die-hards then, as I'm sure 'friendly' MOT stations are becoming thin on the ground...

SkodiRS · 16-06-2003, 12:30

Must admit the MOT is the thing that puts me off; I don't want to have to look around for a friendly tester or have to put a CAT back on for MOT.

That said MOT is another 2 years to go: hmmmmm.........

Have just mailed Jabba about sports CAT so I'll mail out my findings.

Cheers.
Adrian.

DaveU · 16-06-2003, 13:43

I've not got any dyno figures and i've not driven a car with a Milltek full system to compare it against (anyone near Bucks with a std car barring full Milltek that wants to compare?). Hopefully i'll have some soon.

My car is currently std but soon to be Jabba chipped along with induction kit + new DV. Can't wait

(oh and new brakes + fmic + bodykit + suspension thanks to certain people on here - you know who you are

)

16-06-2003, 07:05	#1
DaveU VIP Join Date: Nov 2002 Location: South, then East a little bit. Posts: 2,455 Thanks: 0 Thanked 0 Times in 0 Posts	Imprezive Motorsport Performance Exhaust Hi All, As you may or may not know my vRS has been down at Hayward & Scott for the last week under the watchful eye of Mr Disco (John) having a new full system developed exclusively for Imprezive Motorsport. The system is complete replacement and runs from downpipe to tailpipe. Downpipe: 2.5" Drops straight down and makes its way under car replacing cats. 2 existing sensors are tapped back into pipe. Mid Section: 2.5" gentle flowing bends into End Bit: (technical aren't i :p ) 2.5" into handmade backbox which then splits depending on choice of finish (double welded) - I went for twin 3" as that's what I like, other options include the same twin 3s but slash cut or you could have an oval. When looking at the original system (see photos in following posts) it is incredibly overcomplicated and has uneccesary bends+rightangles all over the place. This new system as you can see is far superior with minimal bends with minimal angles. Sound: It's a lovely deep burble It seems to have 3 styles: 1) Feathering throttle/pootling around Surprisingly refined actually - you can tell it's there but its not intrusive. 2) Pressing on Now it gets interesting! All of a suddenly you hear the mechanical whir of the turbo spinning up followed by what can only be described as (and i've been trying to think all weekend of something similar) a fantastic Cosworth type sound on acceleration. Back off and you get pops and bangs from the backbox 3) Absolutely flat out Well now it just gets silly! If you really punch it you are rewarded with a serious roar! It's quite addictive really Performance: Obviously i'm still overly excited but I reckon this is the type of exhaust they should put on all performance cars. All the popping and turbo type noises you can now hear and feel make you much closer to the car and what it is doing. Where-as before if you wanted to explore the upper end of the speedo you would need quite a reasonable stretch of road, you now don't! You can go from a standing start and just hammer straight through all the gears: 1st, redline into 2nd, redline into 3rd, redline into 4th and redline into 5th. It pulls like a train with no effort - I went past 140 before an inconsiderate corner required me to back off, i've never hit those speeds before on that stretch of (private ) road. Mid range and in gear response times are improved as well with quicker spool up. The car now feels like it has been woken up. Oh - and no CEL either - and that's without the ECU fix which is just around the corner! So, all in all? Very Imprezive __________________ Dave Dave's new runaround ^ The Beast: 2001-2007 (now re-homed). 5 1/2 years of frightening the living daylights out of other road users and ashaming various high end cars. Last edited by DaveU; 16-06-2003 at 07:14.

16-06-2003, 07:40	#8
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Thanks: 19 Thanked 42 Times in 38 Posts	Hopefully mine will be done this Saturday I'm going for the oval as its more like standard but I may keep the hi-flow cat in mine. Glad you like it Dave, all you need now is a front mount, a remap, a brake upgrade and some decent suspension __________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

16-06-2003, 08:05	#10
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Thanks: 19 Thanked 42 Times in 38 Posts	__________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

16-06-2003, 08:21	#11
mannyo BRISKODA Staff Join Date: Nov 2002 Location: Stevenage Herts. Posts: 11,443 Thanks: 56 Thanked 357 Times in 329 Posts	Dave, really nice job. Looks good. Jon, fancy selling me your old miltek. __________________ Manny 2005 Octavia 2.0TDi Elegance combi my skoda website http://www.octaviars.co.uk Join the briskoda.net folding team click Here for more info

16-06-2003, 08:43	#13
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Thanks: 19 Thanked 42 Times in 38 Posts	Check Engine Light Manny, full system or just cat back? If its cat back, PM me. Jon __________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

16-06-2003, 07:06	#3
DaveU VIP Join Date: Nov 2002 Location: South, then East a little bit. Posts: 2,455 Thanks: 0 Thanked 0 Times in 0 Posts	oops

16-06-2003, 07:35	#7
llblake Briskodian Join Date: Dec 2002 Location: Addiscombe Surrey Posts: 212 Thanks: 0 Thanked 0 Times in 0 Posts	Sounds and looks like another satisified H&S customer!! I am still very happy with the rear box that H&S fitted to my RS. I would recommend them to anyone who is looking at replacing the standard RS exshaust system. Lloyd

16-06-2003, 08:30	#12
fen_l&k Briskodian Join Date: May 2003 Location: Deepest Fenland Posts: 2,559 Thanks: 0 Thanked 0 Times in 0 Posts	Looks v. cool. Ahh, us TDi owners can only dream of such things. Could poor downpipe design be VAG's equivalent of Microsoft - got to leave room for after market guys to do a better job?? For the abbreviationally-challenged, what's a CEL??? Howard

16-06-2003, 08:51	#14
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Dave, you have PM. Cheers. Adrian.

16-06-2003, 09:01	#15
Quinten Crossdresser Join Date: Apr 2003 Location: fast lane Posts: 10,031 Thanks: 24 Thanked 41 Times in 38 Posts	Will this custom exhaust (not too familiar with all the terms) fail the emissions test? Or did I misread it and it does still have the cat fitted? Q. __________________ Awooga!!!

16-06-2003, 09:02	#17
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Thanks: 19 Thanked 42 Times in 38 Posts	It will fail an emissions test. You need at least a 200CPI (cells per inch) CAT to pass IIRC, hence me probably keeping the free flow cat I have in place. Jon __________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

16-06-2003, 09:03	#18
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Thanks: 19 Thanked 42 Times in 38 Posts	Cheaper than Milltek, mainly because it has no CAT. With cat I think its a comparable price but I'm prepared to be corrected by Disco (John). __________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

16-06-2003, 09:20	#19
redbaron Briskodian Join Date: Jun 2003 Posts: 9,559 Thanks: 15 Thanked 70 Times in 61 Posts	whats the performance like in comparison to the milltek? as you know ive just had mine on with hi flow cats and big bore down pipe... i didnt feel the difference as much as i thought I would - having said that I absolutely destroyed a tt 225 on my private drag strip. __________________ ________________________________________ Some times I just feel like smiling.

16-06-2003, 12:03	#21
Disco@Impreziv Briskodian Join Date: May 2003 Location: Essex Posts: 88 Thanks: 0 Thanked 0 Times in 0 Posts	Phew, I have been looking forward to this post Dave, albeit with 'nervous' anticipation I take it as read, that you consumed rather a lot of petrol enjoying and testing the system this weekend? With regard to theoretical performance with/without a remap: Without: All turbos require a degree of backpressure to assist in spool up. But none except dustbin sized ones require it to be as sufficient as the back pressure generated by standard exhausts on almost every performance car. The now considerably freer flowing exhaust aids/increases turbo spool up by allowing the combustion to flow quicker and therefore quicker thru the turbo itself. This means that low down spool up is quicker, and also mid-range turbo is vastly improved as the engine can reintroduce the turbo quicker. The ECU will obviously control boost limits etc to that of standard, however low down the car will be able to hit its boost targets earlier which is where the power gains come from. Power is not dictated by boost alone. With: With relation to exhaust alone, the main benefits of adding a remap to the system is that you can a ) Improve the power gains by adjusting other parameters to deal more effectively with the altered flow characteristics and b) if you want you can increase the boost/turbo pressure and deal with the extra combustion more efficiently. Interms of cost, it will work out cheaper (slightly) than a full Milltek, however I'm trying to work out some prices now. The production cost is/was fairly high but I dont want to pass too much on and make it unsellable. 9 times out of 10 it will probably fail emissions test on an MOT, so you'll need to find a friendly MOT station , but if you consider how many Cosworths and Subarus etc out there mostly running decats, you'll realise there are plenty about. Officially this is sold for off road use Anyway glad you like it Dave, sounds like its pretty much everything you were after? __________________ Naughty Scoob specialist, helping develop the thinking mans performance car!

16-06-2003, 12:10	#22
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Q, it will fail the MOT..... Doh! Didn't go tot the next page.:o

16-06-2003, 12:20	#23
Quinten Crossdresser Join Date: Apr 2003 Location: fast lane Posts: 10,031 Thanks: 24 Thanked 41 Times in 38 Posts	So, what you're saying is that it will fail its MOT yeah? :p Guess it's only for the die-hards then, as I'm sure 'friendly' MOT stations are becoming thin on the ground... __________________ Awooga!!!

16-06-2003, 12:30	#24
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Must admit the MOT is the thing that puts me off; I don't want to have to look around for a friendly tester or have to put a CAT back on for MOT. That said MOT is another 2 years to go: hmmmmm......... Have just mailed Jabba about sports CAT so I'll mail out my findings. Cheers. Adrian.

16-06-2003, 13:43	#25
DaveU VIP Join Date: Nov 2002 Location: South, then East a little bit. Posts: 2,455 Thanks: 0 Thanked 0 Times in 0 Posts	I've not got any dyno figures and i've not driven a car with a Milltek full system to compare it against (anyone near Bucks with a std car barring full Milltek that wants to compare?). Hopefully i'll have some soon. My car is currently std but soon to be Jabba chipped along with induction kit + new DV. Can't wait (oh and new brakes + fmic + bodykit + suspension thanks to certain people on here - you know who you are ) __________________ Dave Dave's new runaround ^ The Beast: 2001-2007 (now re-homed). 5 1/2 years of frightening the living daylights out of other road users and ashaming various high end cars.

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