We proudly installed a full complement of Polk Audio hardware in our Evo. The system consists of Polk/Momo MMC650 separates front and rear, and a Polk/Momo MM10 sub (with the dedicated Polk enclosure) in the trunk. An Alpine V12-series amp provides power, and Alpine's CDA-9811 head unit allows us to listen to our MP3's during the long drive down to VIR race course. The Alpine head unit comes with a nifty wireless remote. Exactly when this is supposed to be used escapes us... In the interest of keeping the car down to fighting weight for track use, the sub is mounted so it can be quickly removed. Thanks to the guys at Polk Audio for their help. Make sure to browse over to their amazing WRX project car, which wears many Mach V parts. Trunk View Head unit (off) Head unit (on)