although rude, lsvtecking brings up a good point.

my friend was doing a y turn and backed his car up into the curb. the only part of his car that touched the curb was his wackytacky chrome exhaust tip. he thought thats why his exhaust sounded like complete crap. another friend took a close up look at his entire exhaust and saw that the (i forgot what its called, but its the braided part of the pipe near the cat) was fubared.