Exhaust problems please help!

[sirux]

Okay, I got my apex-i ws2 installed today by some local shop.
I got the whole catback.
Anyways.. I started driving it and punched it a bit and after I punch it something underneth the passenger side pops and it sounds like its hitting the floor.. I checked and theirs no exhaust leaks and I'm not sure what the hell is going on, I brought it back to the shop and they said everything is fine. I kept on driving and it did the same thing.

HELP!

[PatrickJamesYu]

your cat or pipe might be hitting something

[sirux]

I could hit bumps or do anything at all but once I start punching it and it cools down it starts bouncing like nuts..
wtf?

[ZaTHRaS]

mine rattles when it gets wet, if it's the same issue...ooh, just wait!
check these out:
http://www.ephatch.com/forum/showthread.php?58790-Exhaust-rattle&p=805486&viewfull=1#post805486
http://www.ephatch.com/forum/showthread.php?57316-Cat-back-rattles-near-Cat&highlight=exhaust

[SandBagger]

Before the gas tank exhaust pipe offset, Honda did not create the EP3 chassis underneath like older chassis. Where your exhaust is most likely hitting where I am talking about.....right after the cat and the pipe does a 45 deg bend. I had to make 2 3" systems for my ep3..it sucked.

Yeah man, the best thing to do is get longer hangers or heat the pipe up and bend it yourself.