I just finished up a GTMat install of the entire trunk, rear shock towers & wheel wells, and both doors. I used their 70 mL thick rubber onyx product. Wow... what a difference in road noise. Big like night & day difference. No more rock sounds in the rear wheel wells and the stereo sounds way better. I can still hear my Berk exhaust just fine too. One of the best mods I've done. A lot more refined.
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Berk HFC & CBE, Stillen G3, UpRev & tune by PSI, GTMat, 3M, Swift, StopTech, H&R 20/25, GT-R,
324 whp & 262 torque
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