Ive been told by a friend that cutting out the cat would give me an extra few BHP. If this is so will it have a downside other than failing an emissions test. A local exhaust specialist has said he can give me an extra 10BHP by making a new middle box, which in effect would also cut out the cat. Anyone done this and if so was it noticeable?
tommyt
it'll give you better turbo spool up + a bit more top end - and also fail the MOT. The Audi system isn't bad anyway - it runs two cats in parallel which gives good gas flow. The TT exhaust system though is quite restrictive where it runs under the haldex unit at the rear of the car.
Modifying the cats is only really worthwhile if you intend to go over 300BHP. I ran sports cats on my TT
http://www.cs-media.co.uk/~james/tt/ttexhaust.htm
But got them cheaper in a group buy - on their own they are just to expensive for the small gains they give (IMHO)
James.
Modifying the cats is only really worthwhile if you intend to go over 300BHP. I ran sports cats on my TT
http://www.cs-media.co.uk/~james/tt/ttexhaust.htm
But got them cheaper in a group buy - on their own they are just to expensive for the small gains they give (IMHO)
James.
I've got a complete Milltek system on mine with Milltek sports cats and straight through Milltek (no middle box) and it sounds great - being as its on a TTR, its not too 'droney' either. Haven't got a flame kit though ;D
Graham
Graham
Just thought - what age is your TT ?? - the later ones ran dual lambda probes each side of the CAT - allowed the ecu to measure the efficiency of the CAT - something that would cause you probs if you ran a straight pipe even with the probes in place :-/
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