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Forman insulation used to have the good sh*t.... Heavy layer in the middle. Not cheap... But

From many, many years in the industry I can say one thing for certain... the performance of a sound dampening material is proportional to the weight of the material... the heavier the better the performance, and usually the higher the cost. There are also a couple of other areas to look at.... 1) Air intake noise... a good intake filter will dampen much intake and turbo noise. 2) if there are flat metal surfaces in the machinery space like the top of a fuel tank that are above the fuel level... consider adding a little stick on accoustic dampening material... this can also make

Blistering barnacles, it's obviously a thundering typhoon you iconoclast!!!