any one make a pipe that replaces the pipes where thecats are??? if so please fill me in

 

don't know, but you better find some good 02 sensor simulators to go with it. this advice is given for off road use only

 

Yeah. Its called an off-road H pipe, and almost any aftermarket exhaust manufacturer offers one: Corsa, Borla, etc.

Realize that:
- it is illegal -- in states with visual inspections of emissions equipment you will likely get caught, in states without you probably won't

- on a stock LS engine is generally hurts performance slightly to remove the cats: the engine's cam and timing are designed to need a certian amount of backpressure.You will hear people say differently but not those who have actually measured the results on a dyno. On heavily modded cars removing the cats can bring you an additonal 25-30 HP (I run the largest size available on mine and removing them will add 25-30 RWHP, but I still run with the cats.

- if you remove the cats have the engine re-tuned (the ECM re-programmed), removal can result in the car throwing some codes sometimes or running a bit lean at times, both of which are not good.