Okj I am sure this has been asked before but I cant find anything on it. What is the best way to get a lil more speed out of my 86 marathon? Also I have seen automatic batterie chargers would these work on a 12v car battery? I am planing on adding one soon to power my neons and also I am hoping to add a cd player amp and 1 10" sub so I know I need all the juice I can get. lol thanks for any help!