Originally Posted by Kavehman
...If it does, ideally how long should my ground wire be ?
make a difference- you can get as much voltage drop across the ground wire as you can on the positive supply.
Relocating your sub shouldn't be an issue though - wherever it goes, you want to make the ground wire as short as possible (say ~ 18") and ensure you have a good solid connection to the chassis. Make sure you clean any paint off your ground point with some emery cloth and use a star washer to get good "bite" between the terminal & chassis. Bolt it solidly to the body with bolts, lock washers & nuts - no puny sheet metal screws!
Best thing is to use a proper grounding terminal, like one from stinger or whoever takes your fancy. The wire gauge for the ground should be at least the same as that for the power.