hatch or coupe? i always fill the voids with fill foam. tape off the lock and fill er up. works awesome and much cheaper.
go to lowes or home depot get roofing flash its the same thing as dynomat only 1/8 the cost. it will come in a box on a roll did an entire hatch fire wall to tail lights top to bottom for $150.
Thanks! Yes, 150A alternator. No extra batteries, just the XS Power under the hood. The amps are very efficient and only draw 68 amps per to make full power.
Sweet mine is a power hog. Lol. Extra deep cycle in the trunk for the stereo to abuse. At full tilt it wants 220 amps but the subs don't like that much abuse.