Want to horribly de-gut my cat.....

Basil · 02-10-2006, 18:45

Sounds rather vicious eh?

Thinking about taking off my downpipe/cat and taking an 8mm 2.5 foot long masonry drill to the insides....

Is it a simple matter of undoing some bolts to get the cat out or is it a slash-and-cut job?

I read a post somewhere that after you do this, you get an initial blast of smoke as the increased airflow knocks out the carbon, but it shouldn't make the usual idling/cruising exhaust any smokier?

Advice/opinions/comments/lewd suggestions welcomed.....

Cheers

Bas

bengie · 02-10-2006, 19:12

surely you could easily get a straight bit of pipe to replace it?

HellFire · 02-10-2006, 19:14

whats the point though really?

might aswell just get a full turbo back exhaust system if you want any kind of performance gain.

Basil · 02-10-2006, 19:28

Agreed - but figure the cost of a turbo-back system with shipping out to the middle of nowhere, and you'll see the allure of a nice DIY jobbie......

It really is the slippery road to a straight pipe system (ala Jason) but in a logical (???) progression.

Is it difficult to unbolt the offending section of pipe?

vRSLen · 02-10-2006, 19:55

Basil, do you actually need an exhaust sytem were you live? Could you not just
remove it from the turbo back?

devonutopia · 02-10-2006, 20:30

IF you have to do it this way - get yourself some good bit of pipe with good clamps to go over the exhaust where you cut it. Chop it just below the cat, then undo the three bolts on the turbo / manifold, above the downpipe (tricky to get to IIRC - might be easier from underneath or from the top - not sure) Actually might not need to unbolt it here. You might be able to undo one of the exhaust hangers and bend it down enough.

Then, attack the honeycomb from the tailpipe side you chopped through, and run the engine a bit to blow it all out (it might sound nice and fruity

) Then put the clamp over the exhaust on the tailpipe side, slide right down, push the empty cat section back in line, and put the clamp over it 50:50 to rejoin.

(or just weld it if you know someone, or can weld?)

Personally I would use a decat pipe similar to the one I had. Link to folder below.

Index of /jason/DECAT PIPE

tonto kowalski · 02-10-2006, 21:01

What does removing/mutilating the cat do to the emissions?
Will the car pass the MOT?

Lummox · 02-10-2006, 21:13

CAT is not required for MOT, as long as it still passes the opacity test your fine.

devonutopia · 02-10-2006, 21:28

Quote:

Originally Posted by Lummox

CAT is not required for MOT, as long as it still passes the opacity test your fine.

What the wise one said.

Mine's got through 2 MOTs with nothing more than basically a scaffold pole for an exhaust.

02-10-2006, 18:45	#1
Basil Hardcore Join Date: Feb 2006 Location: Bahrain Posts: 3,157 Thanks: 185 Thanked 183 Times in 144 Posts	Want to horribly de-gut my cat..... Sounds rather vicious eh? Thinking about taking off my downpipe/cat and taking an 8mm 2.5 foot long masonry drill to the insides.... Is it a simple matter of undoing some bolts to get the cat out or is it a slash-and-cut job? I read a post somewhere that after you do this, you get an initial blast of smoke as the increased airflow knocks out the carbon, but it shouldn't make the usual idling/cruising exhaust any smokier? Advice/opinions/comments/lewd suggestions welcomed..... Cheers Bas __________________ Fab vRS - Black Magic - PD160 intake - Forge FMIC - colour coded front grille -SLC Splitter - K&N Airfilter -SEAT Strutbrace - Jabba ARB - IC Waterspray (need to wire it in!) - 312mm TT brakes - Eibach Springs - Skoda Reversing sensors - Devonutopia Tuning (tm) Custom Exhaust (2 1/4" straight pipe) - Short shifter mod- 5 brake light mod - Helix Steel SMF + Organic Clutch + pressure plate - Peloquin LSD - TD stage 2 Hybrid - Washbrook remapped ECU - Uprated injectors - Cupra bushes -Poly-filled dogbone - Allard racepipe - Pirelli Dragons - Forge Rear Strutbrace - DIY SS upper boostpipe delete -Koni FSD's - elephant pipe CCV mod

02-10-2006, 19:12	#2
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 14,963 Thanks: 15 Thanked 128 Times in 111 Posts	Re: Want to horribly de-gut my cat..... surely you could easily get a straight bit of pipe to replace it? __________________ owner of a skoda octavia 4xvrs3

02-10-2006, 19:14	#3
HellFire Briskodian Join Date: Jun 2004 Location: Leeds, West Yorkshire Posts: 3,174 Thanks: 0 Thanked 3 Times in 2 Posts	Re: Want to horribly de-gut my cat..... whats the point though really? might aswell just get a full turbo back exhaust system if you want any kind of performance gain. __________________ Metro Blue '06' 5 Door Astra 1.8 SRi

02-10-2006, 19:28	#4
Basil Hardcore Join Date: Feb 2006 Location: Bahrain Posts: 3,157 Thanks: 185 Thanked 183 Times in 144 Posts	Re: Want to horribly de-gut my cat..... Agreed - but figure the cost of a turbo-back system with shipping out to the middle of nowhere, and you'll see the allure of a nice DIY jobbie...... It really is the slippery road to a straight pipe system (ala Jason) but in a logical (???) progression. Is it difficult to unbolt the offending section of pipe? __________________ Fab vRS - Black Magic - PD160 intake - Forge FMIC - colour coded front grille -SLC Splitter - K&N Airfilter -SEAT Strutbrace - Jabba ARB - IC Waterspray (need to wire it in!) - 312mm TT brakes - Eibach Springs - Skoda Reversing sensors - Devonutopia Tuning (tm) Custom Exhaust (2 1/4" straight pipe) - Short shifter mod- 5 brake light mod - Helix Steel SMF + Organic Clutch + pressure plate - Peloquin LSD - TD stage 2 Hybrid - Washbrook remapped ECU - Uprated injectors - Cupra bushes -Poly-filled dogbone - Allard racepipe - Pirelli Dragons - Forge Rear Strutbrace - DIY SS upper boostpipe delete -Koni FSD's - elephant pipe CCV mod

02-10-2006, 19:55	#5
vRSLen Bully Bully :) Join Date: Jan 2006 Location: West Yorkshire Posts: 5,070 Thanks: 169 Thanked 178 Times in 123 Posts	Re: Want to horribly de-gut my cat..... Basil, do you actually need an exhaust sytem were you live? Could you not just remove it from the turbo back? __________________ Current car: Black MKII Octavia vRS Combi Previous: Black MKI Octavia vRS Combi Black Fabia Elegance 100 BHP

02-10-2006, 20:30	#6
devonutopia Mongreller Join Date: Apr 2003 Location: Ooo-ar, Oi be from Devonshire Posts: 29,506 Thanks: 60 Thanked 308 Times in 253 Posts	Re: Want to horribly de-gut my cat..... IF you have to do it this way - get yourself some good bit of pipe with good clamps to go over the exhaust where you cut it. Chop it just below the cat, then undo the three bolts on the turbo / manifold, above the downpipe (tricky to get to IIRC - might be easier from underneath or from the top - not sure) Actually might not need to unbolt it here. You might be able to undo one of the exhaust hangers and bend it down enough. Then, attack the honeycomb from the tailpipe side you chopped through, and run the engine a bit to blow it all out (it might sound nice and fruity ) Then put the clamp over the exhaust on the tailpipe side, slide right down, push the empty cat section back in line, and put the clamp over it 50:50 to rejoin. (or just weld it if you know someone, or can weld?) Personally I would use a decat pipe similar to the one I had. Link to folder below. Index of /jason/DECAT PIPE __________________ Jason - Mongrel owner! WOOOOF! Grrrrr Custom Fabia Bonnet Lifter Kits - £45! Click Me. See the mongrel's 260bhp Dyno Video!

02-10-2006, 21:01	#7
tonto kowalski Briskodian Join Date: Jul 2006 Location: Nottingham Posts: 350 Thanks: 4 Thanked 6 Times in 6 Posts	Re: Want to horribly de-gut my cat..... What does removing/mutilating the cat do to the emissions? Will the car pass the MOT?

02-10-2006, 21:13	#8
Lummox U18 Automotive Join Date: Sep 2003 Location: Newport Pagnell Posts: 21,805 Thanks: 22 Thanked 658 Times in 554 Posts	Re: Want to horribly de-gut my cat..... CAT is not required for MOT, as long as it still passes the opacity test your fine. __________________ Unit 18 Automotive Services now open Servicing, repairs, modifications you name it we do it. Cupra console bushes at special price, PM for a very competitive quote.

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Want to horribly de-gut my cat.....

Want to horribly de-gut my cat.....

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