I just bought a 1990 RX-7 GXL. I was driving it earlier today, and the exhaust got kinda loud all of the sudden. The exhaust tips seem to move around a little when going over bumps and stuff too. What do you think is the problem?
Also, I can hear little pops out of the exhaust like it's backfiring. Is that normal, or do I need a new oxygen sensor or something?
Thanks

 

It's kind of normal to hear light pops, if it's stock exhaust, chances are there's a leak/bad gasket somewhere. Take it to a local exhaust shop and have them go over it to find leaks, if they do, ask them to repair the leak and tell them to NOT use alluminum!