Hello,

need some advice on sound deadening on my Coupe. I ordered the sound deadening kit from FFR, but i was surprised by the fact that it comes in 2 different types; the anti-vibration material ~2.2mm thickness self adhesive butyl compound with aluminum foil and the other is just foam.

Since the sound deadening is not complete in my case, some bits are missing and some seem to be random scraps (by the way most of the numberings on the foam pieces were random and did not correspond to the fitting guide), i am planning on ordering some more of the butyl compound stuff. The question is should i ditch the foam material all together and go with all butyl compound? Are there any drawbacks to it? Also, should i order 2mm, or go with 4mm (not sure how much of a difference the extra thickness will make)? Since i will be running stock exhaust with LS427, my thinking is that the only purpose butyl deadening will serve is to stop the panels from vibrating as there is no point in sound insulation when you have straight pipes at your ear, hence, there is no point in going thicker..?

The foam is meant to be used on the sides and top of the trans tunnel. Are there any obvious reasons not to use butyl compound instead of foam there? I plan on covering the top of the trans tunnel with leather.

Thanks!

Picture of the foam pieces
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