My son, 16, bought a '77 Pontiac Grand Prix. It's loud, with a big motor (muscle-car-type motor, original everything). Anyway, he sawed off the exhaust pipe to make it even louder, even though I told ...
Fiberglass insulation is not airtight. Heck, it will barely even slow air propelled by convection, differential pressure or wind. It is especially helpless against air moving through a leaky pipe ...
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