de-cat

[superior]

im looking at de-catting the coupe, i know where, i know when and i know how much however its dawned on me that it might not run properly will i need a remap afterwards if so does anyone know of a good place south central

[RustyNut]

MRC in Banbury. Go to their open day on the 3rd of August and take your note book and wallet!

[mikeraz1]

I'm having the cat taken off my QC. As far as I know it'll run fine as long as you keep the lamba.

[Fat Audi 80]

Don't worry it will run fine. No remap needed. I have my cats fitted every year for the MOT then they come off again. THe car runs stronger, crisper and harder without them!

Cheers,

Steve.

[Rusty]

You'll be fine but get it done anyway MRC for 3B, Homefries for ABY.

[UUUdirs2newcastle]

Is it a waste of time removing the cats on an RS2, apparently they are race cats so do not restrict performance / or perform better with them?

[Rusty]

It won't do any harm removing them (other than the environment ) you want the exhaust to be as free flowing as possible whilst miantianing acceptable gas velocity. You'll notice the difference right at the top of teh rev range but perhaps nothing in terms of headline figures.

[Henkjan]

my ABY runs fine de-cat'd without remap. major difference imho is the earlier and faster boost at the lower rev band

[lji86]

just had mine done, car runs nicer. mine was done by longlife in london

[s2driveruk]

what setup did yo go for Lewis in the end?

[A80Avant]

i have expressed my feelings about removing one of my cats to have a 1cat system rather than 2.My cats come from BN-pipes 200cpi and 76mm diameter of their core,while their exits are @ 60mm diameter to connect to the rest of the system(made for the OEM system originally).

However a few days ago,after speaking to a mechanic and a specialist,he told me that these cats are good for 700hp,as their restriction and add to backpressure is negligable.He said that having a 2x60 system cat is almost the same restriction as having 1 80mm tube with 1 cat involved.So removing the cats and replacing them with 2x60 tubes does make things a bit more flowy but not an extreme difference.Only a few hp gains if you ask me,not worth the hassle to take them off and back again every once a year.
He also said that minimun requirement for 350whp is 70mm turbo back system and for 450whp 76mm.Bigger after that for sure.

So in my plans,the only change on the exhaust will be the EVO manifold(or...) and the 76mm catback tubing instead of 70mm.

He also told me that he can make me a tubular EM for 850euro and lifetime guarentee(which is what made me start concidering this...)

[lji86]

what setup did yo go for Lewis in the end?

well basically i got there and he got it up on the ramp and released that he forgot that the S2 was twin cat. so i couldnt afford the additional £250 for another cat. so he put two link pipes to decat, welded new brackets on the cats so they will slot in easy. ended up paying about £550 in the end. its a nice job hes done!