all this talk of exhaust has me thinking...

i need a cat converter for my exhaust system, but the pipes are 2.5" so that rules out just about every normal car system i could take one from.

seen this
http://www.maperformance.com/vibrant-performance-metal-core-race-catalytic-converters.html
from america, looks good and cheap, but how would i go about being sure it'll work well before potentially wasting a lok of money?

getting over from US won't be a big issue, not expecting tax will be either...

how do i spec up a cat system?

or what cars have a cat which could be fitted up to my 2.5" system easily enough, to be replaced by the original pipe soon after IVA

[Edited on 25/11/09 by blakep82]

http://www.summitracing.com/parts/WLK-15038/

how much?!

i bought two from summit racing .

one worked , one didnt , i didnt know that until a year later when my motor wouldnt pass mot .

you get hit with a 21.95 fee straight away , and more than likely customs and excise when it gets here .

there is a uk distributor now too .

just fyi - volvo is 2.25 od cat

whats the 21.95 fee? plan is to buy it, and have it brought back from america in my mums luggage

volvo one is interesting though. are they all 2.25? how would i go about reducing the pipe down to join? probably very straight forward lol any photos to see what they're like?

my plan is to remove a section of pipe, weld flanges on so the cat can be bolted in, and the original pipe has flanges added to be bolted back again

cat should slip inside the 2.5 pipe .

21.95 for international customers - you pay shipping / customs when it lands .

my mum's cabin crew she's over there all the time. get it shipped to her hotel, she picks it up, in her bag to bring home. done

you're right, its only a 1/4" difference, so should be alright i'd need to add a bit of pipe to make it the same length for the bit i remove though, but won't be a problem. any specific volvo models i should look at?

940 turbo .

if you need a de cat pipe making , just ask .

2.5 inch is considered normal size over here, 4 and 5 litre engines being the norm, even the smaller cars have 2 Litre plus engines. Most 5 litre V8's would have two cats of that size.

^ i thought that, so 2 cats on a 5 litre engine, kinda almost like one cat for 2.5 litres. put it in a bit better perspective

quote:

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Originally posted by Volvorsport
940 turbo .

if you need a de cat pipe making , just ask .

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Description

so that bit there hasn't got anything inside it, so i'm not really sure what it actually does, but the plan is to chop that bit out, weld flanges on all the ends of the pipes, then make up a cat the same length to replace it, again with the standard flanges to bolt it all up.

not entirely sure how that expansion chamber works. i thought it was a catalyst, but its got nothing inside it at all. should really consider making it into a silencer, as the 1 silencer near the end looks near useless

Expansion chambers are for two stroke motors, works like a tuned header on a 4 stroke, what engine was in the car previous, could be an attempt to quiet the system.
What you have planned sounds good, look for an after market US cat for a Camero or Mustang, some are only about 12" long, smaller because they use one on each exhaust pipe ahead of the muffler or resonator.

it was a vauxhall/GM red top, so definitely a 4 stoke motor. i guess it must give some kind of silencing, but it'll have to go, as its the only place to put a cat as far as i know, it was a pro built racing system so it must do some good.

How far away is that expansion box from your engine ?
The cat wants to be close as pos to it .
Its no good at the rear of the system

quote:

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Originally posted by jacko
How far away is that expansion box from your engine ?
The cat wants to be close as pos to it .
Its no good at the rear of the system

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I think you are pushing your luck back there as you probably now they have to get HOT HOT HOT to work

quote:

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Originally posted by jacko
I think you are pushing your luck back there as you probably now they have to get HOT HOT HOT to work

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