is this bad????

[integralover]

since i have done my exhaust about a year ago. (headers, cat back, and pretty much a test pipe) my exhaust seems to have no back pressure. it will make a back fire like noise when i push my clutch in at certain rpm's and now i have this rattle i cannot get rid of. i think the rattle is coming from the exhaust sounds inside the pipe as it is traveling through the pipe and out. some wierd thing with sound waves. and, since i don't have a cat to give it some back pressure i think this is causing me some probs. i have tried many different things but putting the cat back on(which i don't have anymore) to help rid me of this horrible rattling sound. but is my set up hurting my exhaust valves and causing this rattle? any advice would help. thnx

[b18ls]

Are you sure one of the hangers isn't touching metal. I know this doesn't account for the loss of back pressure and backfireing, but it might help.

[GTR2b]

Which exhaust did you put on your car?
Have you done any other mods to the motor?
How big/small is this exhaust?
Did you install it in your driveway or did you have a garage do it?


These are questions that if answered, will greatly increase the odds of getting a correct response from some of the more experienced people around here.

[integralover]

i did it all myself. it is 2 1/4 inch cat back piping. i'll check the hangers.
and all my mods are in my sig.