here is the other advice " I did the entire floor (from fire wall to trunk) and the rear deck area (read that was source of sound penetration) with raamat. I did it just to dampen road noise, since everything was stock. In the end, I didn't think it was worth the time, money, and effort. I think my expectations were too high, I thought I could achieve BMW like quietness, not even close. My recommendation, it is alot easier to fix the exhaust (slap the old one back on). Plus, getting this crap out of your car is pretty much impossible, so it is an irreversible decision when you put it in. "
I think it might help but i cant do it by myself.
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