Muffler
#5
If you are going to paint a muffler, paint it with something that will have some benefit. Black Satin thermal barrier coating will hold heat inside your exhaust and keep the exhaust gases from contracting due to heat loss which in turn keeps exhaust velocity high.
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#8
I know of a guy who kept banging it up on ground (even with a 3.5" RE lift) He has a 2007 4DR Rubicon. He took it to the local muffler shop and had them relocate it under the driver side out of the way...he is happy where it is...he had them replace it with a magnaflow.