so i was just driving downtown when this big plastic bag gets stuck under the car for about 2 blocks. i pull over and get it out but now my exhaust piping is covered in some nasty looking crud. any suggestions on what i can use to get this stuff off?

also just got back from foxwoods and i ended up running over a cat and hitting a bird in mid flight (really not my night). too tired to have a good look but there seems to be no guts on the car...just a poof of feathers in my rear view

 

It'll eventually burn off and leave a discoloration on the pipe. If it's underneath in a place you can't see, it doesn't matter. If it's on some part like the shiny tips, then that's more complicated. You may have to use a combination of some sort of organic solvent to dissolve the plastic, then polish up the chrome after.

 

My friend had this happen to him on his G2, he took it to a muffler shop and the just put blow torch to it to burn it off. It smells bad until it burns off.

 

the discoloration has definitely begun. there's gotta something i can use? won't using a blow torch ruin the pipe?

 

You need an acetone based solvent (nail polish remover) to rub it off, but be real careful, acetone will dissolve other plastic things on your car. You may need quite a bit of elbow grease to get it off.
You never stated where it's stuck on. If it's unseen, do you really care if it stains? If you feel you must get it off, then use a fine grit sand paper and sand it off carefully.
If it's on the chrome tips, then you'll need to use more care with the acetone and be sure to polish it up well afterwards.

 

it's on the pipe just ahead of the rear axles..not on the mufflers.

well i wanted to sell my exhaust eventually, i have a t1r 70