Just installed my 2 JL 12" W3's last night & OH MY GOD! If you have subs in the back.....DYNOMAT is a requirement TRUST ME! I triple layered the hatch door & the system is incredible! Its expensive but the benefit far out weighs the cost. I crank it & you barely hear it outside the truck with the windows up. NO VIBRATION what so ever. Just clean powerful bass. Install #2 next Tuesday Infinity Kappa components w/Alpine amp to crank the **** out of it.