Exhaust Question

[Chuck996]

Exhaust question - I have a 99 Cab - C2. In my quest for better sound and possibly a few extra HP. I upgraded to the hacked mufflers --- not what I expected. I live in a state that does not have emissions checks. I am thinking the next step is to take out the cats weld in a bypass pipe with the o2 bungs and use the o2 adaptors with my original sensors. My question is -- 1. Will I get a CEL? 2. Will I get a deeper Porsche sound? 3. Do I need to have my computer changed to Euro. settings?

Thanks

[logray]

I would not use the OE oxygen sensors at all with bypass pipes. If you are thinking of doing this look into O2 simulators to prevent CELs. This would not require any ECU/DME reprogramming.

Just a warning though, bypass pipes are VERY LOUD (some race tracks don't even allow them) !!!!

[phillipj]

I tried this with my 996. If you bypass the cats you will get a bit more power but only at the top end.. You will lose torque and drivability at the low end (where almost all of your street driving is). They are obnoxious loud. And not a nice loud either... Not worth it at all IMHO. Get some good free flow mufflers and flash your CPU. You wont get a lot more power but the car will be more responsive and more fun to drive... Forget the bypass pipes.

Edited December 22, 2011 by phillipj

[Chuck996]

:thumbup: Thanks for the help..... Merry Christmas to all my fellow RennTech fans.