Originally Posted by Epstein

I used a combination on some cheap dynamat-esque material and that felt mat stuff.

Oh yeah, and I also run a quiet exhaust, muffled wastegate dump, swapped subframe spacers for real Nismo bushings, foamed lower structural voids, replaced the trunk carpet, and ditched the 1-piece aluminum driveshaft for a stocker. Yes, I'm serious about making the car tolerable.