im looking for some sound deadening material for my 03 VW Jetta. i wanna keep more sound in the car, get rid of interior rattles, and also i believe it also acts as a heat shield. i plan on doing just the doors. So i was looking at Dynamat Xtreme Door Kit, $50-$90 for 12 sq ft. then my good buddy Henry (aka GSteg) suggests Second Skin Damplifier, $66 for 50 sq ft. this seems like an amazing deal and so i was wondering how they compare to the other. thanks!