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gutting the pre-cats
Posted: Fri May 08, 2009 8:35 pm
by TIMSRS
Has anybody removed the pre-cats on the standard downpipe?
My car has a stage 1 with a miltek system (cat-back)
What advantages do you get.
RE: gutting the pre-cats
Posted: Fri May 08, 2009 9:24 pm
by BigMo
10bhp possibly more. More V8 noise
RE: gutting the pre-cats
Posted: Fri May 08, 2009 10:37 pm
by Cornishmoocher
I have removed both...........510 bhp 560ftlb Have a look on youbtube.......
RE: gutting the pre-cats
Posted: Sat May 09, 2009 3:08 am
by ataRS6
I have completly removed mine and replaced with 3" miltek down pipes the V8 sound is the best and you get quicker spool up feels much more responsive
RE: gutting the pre-cats
Posted: Sun May 10, 2009 9:25 pm
by tartan_rob
MRC did mine, on std exhaust otherwise though.
RE: gutting the pre-cats
Posted: Mon May 11, 2009 7:57 pm
by TIMSRS
Did you notice any advantage when they did it ???????
RE: gutting the pre-cats
Posted: Wed May 13, 2009 8:28 am
by tartan_rob
I had it done at the same time as remap and new torque convertor. When I had this done on my B5 S4 it was a standalone piece of work. The turbo's spooled easier, held boost longer and released some extra noise. Underbonnet temps should be lower too.
RE: gutting the pre-cats
Posted: Wed May 13, 2009 4:56 pm
by S2tuner
Exhaust gas temps will be lower too with gutted precats, so all in all, less stresses on your turbos in the long run
RE: gutting the pre-cats
Posted: Wed May 13, 2009 6:25 pm
by Cornishmoocher
if you gut the cats be sure to get the map to go with it, otherwise you will get an EM warning- cat below efficiency bank 1 & 2.......
RE: gutting the pre-cats
Posted: Wed May 13, 2009 6:57 pm
by TIMSRS
Yep this is what Grizz has told me. he is looking into a map for the stage 1 that removes the EML and cuts out the cat signals.