Alright I install Nismo exhaust which I bought from another member on here and ever since I have installed it when reving above 3500 rpms I get a really loud trumpeting noise (like opening a cutout or something) oh and P.S. the muffler has a small dent on the bottom side of it (dont know if that matters). When the noise begins my car is REALLY slow and acts like it doesnt even want to get near redline (revs gain like 1/8th of the normal speed). I have already been checked for exhaust leaks 3 times and found nothing, I changed out my high flow cats for test pipes and that didnt fix it so I really dont know what it is now. I have stock headers...so I am kinda throwing that out. I have other mods but they are all N/A Plenum, pulleys, intake...junk like that. If anyone has any ideas I would REALLY appreciate it!

Thanks in advance.

 

Bump

 

I tried unplugging my battery and MAF today and it didnt do anything....need help!

 

99% of the time when ever a car is modified and then has a problem, it is becuase of the modification. Re-install the stock exhaust and see if your problem goes away. Then take the time to inspect the aftermarket exhaust for anything that could be causing your problem.

 

Yeah thats what I am thinking about doing....pain in the ***.

Thanks anyway!

 

Stock exhaust is back on and car is back to pulling hard. Thanks guys!