I have a 96 GT and I put a 2.5" BBK Off-Road H-Pipe with no cats on my car. I feel that my car was faster with the stock h-pipe that had 4 cats instead off the off road h-pipe I have now. I heard that it might be because of loss of backpressure. Sure, it sounds great, but I lost some performance. Let me know what you think.

 

hmm never heard of that. but a reduction in back pressure is better than an increase so your should have picked up some power, instead of feel maybe you should do some strip time install stock h pipe and run then install the other h pipe and run.</P>

 

Did you install the MIL eliminators? If not, your O2 sensors are telling the computer your CATs aren't functioning properly, and your car is being fed excess fuel to help preserve the engine from failure. That would be why your car feels slower... Is your light being tripped? If not...I'd look into getting that fixed first!!</P>


Once everything is sorted out, your upper RPM HP will be much more noticable than your TQ increase, therefor giving you the illusion that you lost power...</P>

 

yeah if you get rid of the cats on a 96 and up car thats controled by an obdII computer it will think the cats arent working and that the car is running wrong it will put the car intoa sort of limp mode. Caspers electronics makes an o2 simulater to solve that problem.</P>

 

I really do appreciate all the suggestions you guys are giving me. I have a superchip in my GT and I actually reprogrammed it to take my car out of Limp Mode. So the "Check Engine" light doesn't appear anymore. I just feel that since I installed the off road h-pipe my engine winds out too much in one of the gears when I go wide open throttle (WOT). Since I have an automatic, I can't shift differently to correct the problem. I could have the superchip reprogrammed again to correct the shifting pattern, but I don't feel like spending more $$$. I willprobably get either an H-pipe with high flow cats, an X-pipe w/ high flowcats or one with a power chamber.

 

Why get another H-pipe with high flow cats when you already have an H-pipe?</P>


That's a prime example to why you don't buy a chip until you are done modifying your car. Sorry to hear about that..Try a shift kit.</P>