Can someone help me out (exhaust setup)
 

So I have regular test pipes (no brand) and an invidia Gemini exhaust with the resonators deleted. I have a horrible rattle in the exhaust. I know that the invidia exhaust without test pipes is fine, it sounds great. But with these test pipes it sounds horrible. Should I buy name brand test pipes or a different catback exhaust?

Are you sure everything is tightened up under the car? Is the catback hitting anything to cause a rattle? I am not sure what would be rattling inside of TPs, since it is just a straight through pipe.

Found another thread while google searching that might have some answers for you.
http://www.the370z.com/intake-exhaus...k-exhaust.html

I had a rattle. Turned out to be a broken marriage of two flanges.