I'm currently running without my insulation but I never drove the car with it in place so can't give any comparative insight. Given that there is a gas tank and spare tire well separating you from the engine bay I'm not sure you will notice any heat or noise increase but that's just a guess.
I pulled it from the shop car. Put in some 1/4 inch dynomat. Had the fuel tank out so the dynomat is between the tank and firewall and inside the spare tire area. Haven't had any heat issues.
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