I noticed yesterday while I was sitting at a redlight that theres a rattle coming from somewhere sounds like the rear axle area... Any ideas? Only does it when I'm idling, even if I tough the pedal up to 600 RPMs, it goes away.

My guess is an exhaust mount, but I'm no expert in terms of the underframe of our cars..

 

if you look in your drivers side rear wheel well, near the back, you will see one of the muffler hangers. The bolt can sometimes come loose and the metal collar thing can vibrate. Check that out.

 

will do, thanks!