Finally got it in after bedliner and Sued-Tex flocking. Love the boldness of the red fibers. Took a long time to get this right, but I feel like it's ready to show off. 1/4" Acrylic window flexes a little, but not enough to dramatically affect output. The subwoofer is a Rockford Fosgate P3 shallow 10" getting 600w at full bore so it should last a long time. Powered by Kenwood KAC M3004, 4 channel mini amp. I took a chance putting this together. Low RMS power; loading the subwoofer against the floor.. lots of variables that could have rendered a poor outcome. I'm proud to say this has turned my Z3 into a powerhouse of sound- an outdoor concert if you will. It's impressed all who've sat inside so far. Top up, and top down. 80mph on the highway? Music STILL sounds great.