My exhaust rattles sometimes. I thought it was the muffler and I had it replaced but the rattle is still there. I don't know if it's the tailpipes or what. I've gotten under the car while it's running and I still can't tell. Has anyone else had this problem? If so, is there an easy solution?

I suspect one of two things. First, check to make sure there is no contact between pipe and heat shields. There are a couple of heat shields on the rear of the car and one above the converter. If there is clearance between pipe and shields, the second source would be a converter that's breaking up. You've got pieces of "brick" that's broken away and is now floating somewhere, either in the converter or in the intermediate pipe. With the engine off and exhaust somewhat cold, hit it with your fist to see if you can closely proximate where the rattle is coming from. If it's near your converter, it's probably a loose "brick".

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Former Paxton (6-psig): 12.57 @ 111 mph.
Former Paxton (6-psig) & former 50-hp nitrous: 12.04 @ 114 mph.
Current ATI D1SC (Initially 10-psig): Projecting high 11's.
Future ATI D1SC (15-psig): Gotta catch them pesky 26-psig boosted TTA's!!

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.