I like to jam out when I'm driving too. And I put about as many miles on my GT as you. The Mac sub can buckle under certain loads but I've found that only happen when I factor in bass amplification to the eq (still using the Mac radio). It would be nice to add a more robust system to the GT but I'm not going to tackle that job until I decide to dampen all the external sound factors. -don't start crying about the exhaust, you guys know what kind of exhaust I have. I could cut my ears off and mail them to Enzo Ferrari, I'd still here that sweet GT V8 singing to me. I would add lots of blackhole insulation to the doors and floor and dynomat everywhere. Of course the easy answer si headphones. Let us know what you go with.