Original exausts without pre cats.

Post by **paulito1** » Fri Jun 29, 2007 8:13 pm

Hi everyone.

Please tell me if someone have tried to take off just the pe cats in an original exaust.
I ear something about that and they say thay you will get more torque and HP.
Some informations will be apreciated before i cut mine!

Thanks

Post by **derdle** » Fri Jun 29, 2007 8:30 pm

I've just had my precats degutted but then remapped. Standard exhaust. I think the consensus will be that you should have a remap afterwards......but I will be guided by people who know better than me!

Paul

Post by **RS SYED** » Sat Jun 30, 2007 12:27 am

whats the process of gutting the precats?
regards

Post by **derdle** » Sat Jun 30, 2007 8:36 am

Easy to gut the precats......Doug.

I took mine to MRC to have it done. There is a thread somewhere about gutting precats, but am in a hurry and can't locate it yet for you. Hopefully someone else will know of that thread and will post a link for you.

Paul

Post by **Jarv** » Sat Jun 30, 2007 9:33 am

And how do you rate the MRC remap against the MTM one Paul? Blatant threadjack I know, sorry.

Post by **quattrosteph** » Sun Jul 01, 2007 11:19 pm

Done it on mine and had a rolling road done after to compare. It does increase the torque a lot . Precats are right at the exit of the turbo's wish is not good for the flow, and precats keep the heat near the turbo's wish is bad as well.

Post by **fletchie55** » Mon Jul 02, 2007 6:50 am

gutting the pre-cats on an RS4 exhaust isnt that easy because they are 400cell and therefore fairly solid compared to other pre-cats on S4 for example, it can be done with a decent drill and some decent large drill bits, many people use auger bits I think.

you dont need a remap for this mod to take an effect, removing the pre-cats will instantly reduce the backpressure allowing the turbos to spool up faster, and will make the engine more 'free-revving'. If you are thinking of having a custom re-map at some point anyway, then it would be better to have it after gutting the pre-cats than before.

Post by **quattrosteph** » Mon Jul 02, 2007 4:26 pm

the easy part is to get the precats out as it is soft to drill !!! the hard work is to get the down pipes out and back in !!!!! Because it is a real pain in the ass !!

Especially if you have big fingers!!

Post by **Newdub** » Mon Jul 02, 2007 6:36 pm

Does having them gutted make much difference to the sound? i.e any louder if so does it sound any good/bad

Post by **quattrosteph** » Thu Jul 05, 2007 7:50 pm

After the mod it does sound a little bit more raw inside, like a sport car should be

Post by **fletchie55** » Fri Jul 06, 2007 9:47 am

and you'l here the whistle of the turbos much more!

Post by **quattrokid1** » Fri Jul 13, 2007 5:28 pm

shh!! dont tell the Mrs:)

Post by **musty1** » Fri Jul 13, 2007 10:46 pm

did anybody find the thread that derdle was talking about?

RS246.com Forum :: The World's #1 Audi R, S and RS Enthusiast Community

Original exausts without pre cats.

Original exausts without pre cats.

RE: Original exausts without pre cats.

RE: Original exausts without pre cats.

RE: Original exausts without pre cats.

Precats

RE: Precats

Precats..

RE: Precats..

Precats

RE: Precats

RE: Precats

RE: Precats

Who is online