i just installed a cat-back stillen exhaust on my 03 G sedan and everytime i hit a bump it feels like 1 of the pipes is rattling against something...i love the sound of the exhaust but the rattling sound is driving me crazy...it may be the pipe that goes over the sway bar but who knows...i did the install myself and everything came out perfect EXCEPT FOR THIS FRIGGIN RATTLING!!! somebody lend some advice please...thanks guys

Something is probably not tight. Maybe a gasket got pinched weird or something?

How did you face the clamps? Just go back under and double check your clearance around everything. Adjust as needed.

I have the same exhaust and don't have this problem. Also did my install myself. Check under the car, something is loose or not installed properly. While you're under there push up on the exhaust and move it around to duplicate the rattling and figure out where it's coming from.

make sure the forward mount braket nuts are tight (the ones near rear door)... its metal on metal and will clatter.

stillen test pipes? its called rasp...i just installed mine today. that rattling is called rasp and i hate it sounds like a civic =[

heatwrap i herd does the trick tho.... i hope =[

let us know if u heatwrap it!

im going to check out my local auto place and see if theyre open but its sunday so im not sure but i will let you know!

Rasp doesn't occur when you hit a bump... OP has a clearance/loose piece problem.

It might be a loose heatshield or even an exhaust leak.

^ +1. i was going to mention the heatshield as well. make sure the exhaust is not contacting the heatshield.