I can not stop tinkering with the car even if it is up for sale. I am finally addressing the drone by installing J pipe resonators next week. My headers are wrapped past the rear firewall. My enclosure is covered with the butyl rubber/aluminum insulation and its still very noisy. The only areas not covered are the rear firewall and floor. Would adding insulation help there? How about the fiberglass type used in new cars for the engine cover panel? I'm not looking for quiet quiet but at a point my passenger can hear me.
Larry