the last 2 nghts when i have come in from driving my car i get out in the garage and there is a potent burning smell like something is actually on fire. i crawl around and sniff(go ahead and picture this in your head) and it seems to be coming from the rear of the car, the rear rotors are warm but the rear calipers are still pretty cool to the touch, i am baffled, any suggestions?

 

Clutch?
Plastic bag on the B-pipe?

 

I've had the exaxt same smell. I've also had it checked out by the dealer and others more than once. Supposedly everything is fine. So, I don't know...maybe it's semi common.