magnex, milltek, blue flame, or custom?

[Adam K]

i want an exhaust for my vrs this month mainly because my original one has deteriorated and is on its last legs.

the milltek is the most expensive of the bunch, but it is really better than anything else?

also what is the advantage of going for a sports cat rather than a de-cat?

somebody please help me make my mind up!

[lewisgraham]

miltek ! they are a subtle but effective exhaust,

sports cat.....not a decat as they dont have backpresure and can **** up your turbo

[Adam K]

Originally Posted by lewisgraham

miltek ! they are a subtle but effective exhaust,

sports cat.....not a decat as they dont have backpresure and can **** up your turbo

but will it fook up a turbo, or is it just one of these things people love to tell you? has anyone replaced their exhaust with a decat and broken their turbo?

[ultra_joel88]

I like the look of the blueflame myself, milltek probably better quality but not a fan of the twin exit.

[jasc1988]

I like the look of the blueflame too..


Diesels DONT need backpressure, thats petrols

I decatted my 306 hdi and the performance gain was very noticible. I had it for 40k and no turbo problems but that is a different car.

I honestly dont know if it will effect turbo or not but is a hell of a lot cheaper than a sports cat and offers more gains

[skudmissile]

I de-catted mine, then a week later the turbo went pop..... draw your own conclusions

I have my car de-catted now, but hopefully my turbo is indestructable

[jasc1988]

Originally Posted by skudmissile

I de-catted mine, then a week later the turbo went pop..... draw your own conclusions

I have my car de-catted now, but hopefully my turbo is indestructable

it better be

[Adam K]

i am tempted by the blueflame, they sell them on ebay direct from the factory. will give the seller an email and get a price from them with backbox and decat.

the thing is, i do like the more subtle look of the milltek, whereas the magnex and blueflame look a little large.

[jasc1988]

Originally Posted by Adam K

i am tempted by the blueflame, they sell them on ebay direct from the factory. will give the seller an email and get a price from them with backbox and decat.

the thing is, i do like the more subtle look of the milltek, whereas the magnex and blueflame look a little large.

i think its the other way, blueflame fits the cutout nicely and almost looks OEM while i feel the miltek looks out of place

[djswivel]

On my second de-catted deisel. My golf did 30,000 with it no probs, so far the fabia has done 3500 no probs.
I got a custom system made up to look almost identical to the factory system.

[novaneil]

Why do people think De-CAT's damage Turbo's??? I've had plenty on Petrol Turbo cars with them and never had a problem.... sounds like a myth to me. Just like how people think Induction kits damage MAF's

Sports CAT's on a diesel's are a waste of money because NO CAT is required for the MOT.

[oilburninnut]

Originally Posted by novaneil

Why do people think De-CAT's damage Turbo's??? I've had plenty on Petrol Turbo cars with them and never had a problem.... sounds like a myth to me. Just like how people think Induction kits damage MAF's

Sports CAT's on a diesel's are a waste of money because NO CAT is required for the MOT.

iduction kits don't damage mafs,gimps overoiling induction kits damage mafs,standad turbo's on re mapped cars seem to break when a bigger downpipe and de cat are carried out,this isn't proof or anything but maybe thre is a link between the two,so i'm waiting till my hybrid goes on to do these,a very well respected and knowledgable member on here has a theory that the standard turbo with less backpressure allready running at close to max with a re map maybe is allowed to spin too fast by the reduction and so destroys itself,as i said not proof just a theory

[Mossman]

Agreed - this is the advice I have been given too - wait for a bigger / stronger turbo prior to exhaust.

What I am really struggling with at the moment is that everything looks like it needs doing at the same time!

1. bigger turbo
2. exhaust
3. fmic
4. clutch
5. mapped

= big ££££s!!!!

I feel the clutch might be next on its own....

[novaneil]

Originally Posted by oilburninnut

iduction kits don't damage mafs,gimps overoiling induction kits damage mafs,standad turbo's on re mapped cars seem to break when a bigger downpipe and de cat are carried out,this isn't proof or anything but maybe thre is a link between the two,so i'm waiting till my hybrid goes on to do these,a very well respected and knowledgable member on here has a theory that the standard turbo with less backpressure allready running at close to max with a re map maybe is allowed to spin too fast by the reduction and so destroys itself,as i said not proof just a theory

Oh I see, but surely thats what the wastegates for... To stop the Turbo from overspinning giving too much boost??? Maybe it just spikes too fast when spooling up or something. Either way its a good excuse for a hybrid if it happens

[oilburninnut]

Originally Posted by novaneil

Oh I see, but surely thats what the wastegates for... To stop the Turbo from overspinning giving too much boost??? Maybe it just spikes too fast when spooling up or something. Either way its a good excuse for a hybrid if it happens

agreed i think this is what this other person was getting at who knows

[oilburninnut]

Originally Posted by Mossman

Agreed - this is the advice I have been given too - wait for a bigger / stronger turbo prior to exhaust.

What I am really struggling with at the moment is that everything looks like it needs doing at the same time!

1. bigger turbo
2. exhaust
3. fmic
4. clutch
5. mapped

= big ££££s!!!!

I feel the clutch might be next on its own....

no if you do the clutch next get the diff done at the same time,no sense in droppingthe gearbox twice eh jon?

[skudmissile]

Somebody call

Gary is right, Only a fool would fit a clutch then only to drop the box off again to fit a stronger clutch and a diff

This came from a person on here who is very and i mean very respected in the world of tuning diesels.

He went abroad to see the effect on de-cats on the VNT turbos..... I think they drilled holes in the turbo casing in order to measure the rpm of the turbo..

Their conclusion was that with less back pressure the turbo is allowed to over spin. This creates very large lateral forces on the turbine blades causing them to break up. Even if the blades dont break up the bearing will not be able to cope with the extra RPMs and will probably seize.

I can also go from personal experiance on this, I decatted my fabia, a week later the shaft in the turbo seized and snapped in two

On a standard map the turbo will be well within its working RPMS and boost pressures so in theroy a de-cat will be fine. But on a mapped car the turbo will already be working very close to its design limits if not past its design limits.......In simple terms you wouldnt catch me ever de-catting a re-mapped car with a vnt turbo.

Like neil said its not a problem on petrol turbos as the turbo is controlled by the opening of the wastegate........ on a vnt turbo there is no wastegate the turbo can spin to infinity if it wasnt to

[Lofty86]

Why dont you get a cat back system, then get a bigger turbo and cat replacement at a later date?

Ive heard the blueflame looses power, not quite sure where i read that tho.

[wrusst]

i know magnex are quite cheap and make exhausts for astons but when i rang them the didnt have i dyno graph for there system

[Richardsvrs]

i have a custome powerflow exhuast system which has been decated and im still running the standard turbo, it rounds lovely a nice deep rumble, i then took it to jabba for a custom remap and am running 180bhp and 330ft of torque, and i ave add no problems with my turbo, thought when i went for the remap he advised not to go for the generic remap incase the turbo back serged and went pop, so instead he took into consideration i had decated the system