Doug, How did the BITEC roofing underlayment work for sound proofing? I am disappointed at the high prices that dedicated automobile sound proof mat cost. A economical substitute would be appreciated. Thanks, Clark
Clark, I don't have a lot to compare it to, but it did a nice job of making the car feel solid and not tinny, like most Mustangs feel. When it had the toploader, before I cut the hole for the shifter, and driving down the road with the windows up, I thought it did a pretty good job of sound deadening. I'm not going to say it was quiet, but even with the Borla ProXS mufflers, you could hold a conversation at pretty normal levels. My Mustang has the folddown rear seat though, and that metal rear panel allows a lot of sound from the trunk area to creep into the car, so I also have that heavy mat inside the trunk area, just covering the tank and side frame rail areas, and that helped keep that to a minimum. I also have it inside the doors, but stopped short of putting it on the roof, which would have helped even more. The hole for the Jerico shifter changed all that, and it allows a lot of engine and road noise in, but it's still not terrible. Of course once the exhaust comes off, that all goes out the window, but even then, the car has a solid feel to it. The big drawback is that matting is heavy. Very heavy. But that's what it takes to dampen the sound waves from traveling through the sheetmetal. Since I started drag racing the car, I debated about taking it out. It would probably save me about 50 lbs in weight, but I think it would border on being unbearable for long trips then.
