as mob17 said, it's important to first figure out what stock system you have. ms-8 is most useful if yo have the factory base stereo. the headunit can connect to the ms-8 & you can power all of your current speakers off the ms-8's 8 channel amplifier. this will improve staging & sound. you can enhance this further by adding components and/or replacing the underseat subs & adding a higher powered amp. technic on this forum sells a complete wiring kit that would make the install plug & play. let me know if you have further questions. thanks for your interest!
ams fmic & cpe d/p yet to be installed; procede v5; koni sports w/ swift coilover conversion; m3 rear camber arms; apex ec-7 wheels; JBL MS-8; Morel Dotech; SWS-8xi