The muffler should be an inch or two away from the heat shield, and the heat shield should have a quater inch gap from the body.

Your muffler should be just barely too hot to touch. I can put my hand on my muffler for a few seconds before I have to pull it away. Make sure they did not attach your exhaust to the body with any metal, as it will conduct heat. They should be rubber hangers.

How hot is hot?

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2