... you might want to continue the LIZARD SKIN on the engine side and use Dynamat on the inside ... Dynamat made a huge difference in my car.
If cost was not a factor ... I would recommend 1", 11/2 or 2" mineral wool with foil face (FSK) ... it would be applied with stud weld pins and cups right to the back side of the fire wall. Could do both sides ? and you could fly me out to Colorado and I would do it for you .... LOL
Ron
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