ok so i am ready to remove my downpipes and make some piggies. the car is chipped, darintake, 710ns, etc and has neuspeed 3" exhaust. i know i want to gut the precats and use defoulers on 2nd o2 sensors for ecu codes. does it add any power or sound alot better to remove the 2nd cats and get test pipes welded in? my car still has neuspeed muffler and resonater so it shouldnt be too loud with test pipe should it?? also did you guys buy new gaskets and nuts/washers when reinstalling pipes to turbos?? or just reuse them. thanks in advance guys!! hope this mod helps open up the s4 alot and gives it a nice exhaust note!

 

I would just go piggie pipes. The main cat of the s4 is very efficient, so much so that removing it probably would not show noticeable gains, but taking out the primary cats will provide as much as 30hp

 

On my stage 3 setup it made a noticeable difference with the main cats out.

 

We have downpipes that we manufacture in-house. They are easily the best downpipes on the market

http://www.raimotorsport.com/RAI-27T...rai27t3dps.htm

 

i'd go fast intensions down pipes with high flow cats... sounds incredible!