worth making a decat pipe

gfromleeds · Aug 6, 2011

Just a quick question
I have reason to belive that my right had cat has collapsed
I also have loads of 3" tubing kicking around
So is it worth removing the cats and puting a straight through sleave on?
What benifits will i get/what draw backs too? Do i leave the lamber sensors in?
I know its not mot-able but it'll give me time to get a new one then
Please dont go on about how if the police find out i can get done cos in 17 years of driving ive never had a copper look under the car

jamesmartin · Aug 6, 2011

you can remove them but leave sensors in place depends where you get it mot mine lets them pass

gfromleeds · Aug 6, 2011

Will i see any performance/comsumption diferance worth noting

jamesmartin · Aug 6, 2011

not unless they were blocked

acc · Aug 6, 2011

gfromleeds said:
Will i see any performance/comsumption diferance worth noting

I did it on my one of my old V8 classics, but you need to leave the lambardas in place or it will cause ECU issues. You will see a difference in power and an improvement in m.p.g.

By taking the cat away you remove a restriction the slows the exit of exhaust gases. MOT does depend on your relationship with the tester.

Alan

gfromleeds · Aug 6, 2011

jamesmartin said:
not unless they were blocked

I think the right hand one probably is
It runs a little rough on tickover and the cat its self has a rattle like somthings loose inside

jamesmartin · Aug 6, 2011

id remove them happily

gfromleeds · Aug 6, 2011

jamesmartin said:
id remove them happily

Lol i bet you would
how much are 2 cats worth these days?

jamesmartin · Aug 6, 2011

no i wouldnt remove yours but would mine in same circumstances i would waqnt more than £50

gfromleeds · Aug 6, 2011

jamesmartin said:
no i wouldnt remove yours but would mine in same circumstances i would waqnt more than £50

Ah im with you now lol
My heads still abit fuzzy. Late night early morning and somones emptyed my bottle of jack daniels

rasheed · Aug 7, 2011

I'd be interested to hear how you get along, particularly noise levels once cats are out.

gfromleeds · Aug 7, 2011

rasheed said:
I'd be interested to hear how you get along, particularly noise levels once cats are out.

well ive just finished choping up an old cat i had behind the shed
pipes were good but a missfire killed it on my old rr
came across few problems
firstly the pipe going into the cat is 60mm o/d and the pipe coming out is 55mm o/d so that caused about an hour of head tapping
secondly the pipe that comes out is a good 3inch higher than the pipe that goes in im hopeing that the main part of the system will pull down far enough for that with i bit of a bend over my knee and some revised rubbers
anyway ive have a mate weld it all up and its waiting to be put on
but thats gona have to be next weekend now cos ive found ive got a snaped stud on the manfold to cat flange,so thats to be taken off and drilled out.
but ill keep you posted

rasheed · Aug 8, 2011

cheers! pics would be great... ahem. and maybe a bag of chips and a pint since looking at those pics might be thirsty work.

worth making a decat pipe

gfromleeds

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