Tuned Muffler systems
 

Hello All,
I am installing tuned muffler systems this winter into my 40% Carden Extras, and would like to know, do any of you guys do anything to the pipe tunnels to protect them from fuel residue and heat protection? I have never noticed any in planes that I have checked out, but never asked. Any sugestions ??? May I also note, that I am using Stainless flex headers and KS rear exhaust cans.