Steve C.

iTrader: (2)

I have FLP LT headers, custom FLP Y pipe with high flow cats and borla catback exhaust on my 2002 WS6. I was looking to put in the off-road pipes and take out the cats, so my car would run with virtually no back pressure. Is there any danger to running a "stock" motor with just basic bolt-ons and have no back pressure? I have heard that some back pressure is good, and if you dont have any you might warp something in the engine. I was just wondering the ups and downs to back pressure on the exhaust system. Any advice and opinions would be appreciated, thanks.

MeentSS02

iTrader: (11)

Well, FWIW, I run a catless true dual setup that goes through bullets coming off of Kooks headers. My car is a bolt on only car, and has suffered no ill effects. Neither will yours IMO. If I were you, I'd be more worried about the sound with that setup. I've heard what you are talking about doing in person, and it is rasp city.

technical

You won't see 0 back pressure unless you cut the header primaries down to about 1" and run 8 little pipes.

edit: Oh yeah...uh that's bad. Don't do that.