Minimum Dynamat

[bobcat68]

You could use some Thermal block from second skin under the car.

[another69]

I am using some self adhesive aluminum heat shields from DEI above the mufflers, and I am going to try and squeeze some between the headers and floor as well. It looks a lot like the stuff you see OEMs use, and I hope that it also helps. I am tempted to wrap my exhaust pipes- I bet that might help with the heat, but I've never seen anything other than headers wrapped.