AN ALTERNATE SOUND SYSTEM IS OFFERD FOR THE 2001 ,M AUDIO SYSTEM WITH ENHANCED BASS, WHEN ORDERD THEIS SYSTEM INCORPERATED THE M5 DSP SYSTEM BUT THETHE FRONT DOOR MIDRANGE SPEAKERS ARE UPGRADED TO COAXIAL(2 WAY)SPEAKERS,ANDEXISTINGSUBS ARE REPLACED WITH 2 10" FREE AIR SUB WOOFERS (NO ENCLOSURE)FOR MORE BASS PERFORMANCE,BOTH SUBS USE A KEVLAR COME..LARGE NAVIGATION SCREEN TAPE LICATED BEHIND SCREEN (6.5IN AND16X9)FORMAT) ALL THIS INFO I FOUN ON THIS SITE SOMWHERE