i installed test pipes this weekend and i drove with them for about 500 miles and then a loud knocking/ticking sound, its really loud and i'm not sure if its from the not enough back pressure or its just something that went wrong with the engine, if anyone has any experience with this please give me some insight, thanks

i also have a full cat back exhaust to.

 

We would at least have to hear the sound to try and diagnose the problem.

 

Probably the sound of your exhausts hitting something.

 

Could be your test pipes ticking from heat and expansion, but a video would be key.

 

im away from the car this week but its not the exhaust or test pipes hitting anything, i think it might be the tct going, would having the test pipes cause to little back pressure and effect the valves in any way?

 

Is your exhaust system the only thing on your car that is modified? I seriously doubt that test pipes are causing engine knock considering how many people run them with no problems. Did you maybe fill your engine up with regular gas instead of premium or something?

 

no I only put 93 in, my oil pressure was also lower than normal, wonder if its a bearing or something internally