firstly, with rm1000 i suggest you do security plating for your car and grounding cable.
security plating - add some metal to your doors so people cannot pry open ur door and steal your car. there is a point near the bottom that when using a screw driver can open the door without triggering the alarm.
grounding - well, don't expect miracles, just good measure. better electricity flow, your cabin lights won't dim/flicker when on/off aircond, your headlamps abit stronger (mebbe kenot notice), if you using std player without amp and pump up the volume your player lights won't flicker when its booming the bass :P