exhaust question

fwc · Post by **fwc** » Wed Sep 23, 2009 7:37 pm

hi, im new here, although a lot of you will know my car, ill postin the newbie section in a minute.

i have a 480 turbo, running quite high power, and the back box needs replacing. its currently a 5 inch tailpipe, which fr me is too big anyway, and im after a little more noise.

I have a plan, which is to cut the pipe right down, and have a straight pipe from the cat to just before the rear nearside wheel. Im assuming there are no legal complications with doing this, but is this going to make the car excessively loud?? i had read somewhere that it shouldnt be too bad on a turbo, but just want to check before i get the angle grinder out.

thanks

dave

aibast · Post by **aibast** » Thu Sep 24, 2009 7:29 am

I ran my car with a 2,5" race CAT and a twin straight trough resonators and wasn't all that bad, but still for use every day i think it's to much noise. Added a straigth trough muffler later. Haven't you heard that noise doesn't make power, but power makes noise? I suggest to get a high flow CAT and add a nice straight trough muffler inplace the stock box in the back. Thats the real restriction on the exhaust. And I think I can't pass MOT with out a cat. Also the stock size exhaust on stock boost levels is ok.

Besides it's a R4 engine, they never sound good with any exhaust.