Suspension squeek maybe?
 

I got my o/r x pipe installed maybe about a month ago. Ever since then, i hear this squeeking noise!! it's not noticeable with the windows up but when they are down i can hear it really good at low rpms. It's only happens when i hit bumps. I'm thinking it's a suspension squeek but i'm not sure. it's sounding like it's from the rear right tire. Anybody had this problem?

Squeaks and noises are from dried out bushings.My 04 has already had the lower rear control arm bushings replaced.Under warranty?

i have about 500 miles left on my warrenty. whew...i'm taking it in tomarrow!!!

Mine does that too...I probably voided the warranty when I installed my Eibach Pro-Kit though...does anyone where I could order those bushings?