I bought some Infinity Kappa component speakers (4 total; 2 for the doors and 2 for the rear deck) and was told that I need to re-wire the car in order for them to work properly off my external amp (a 400 watt rms Kicker amp). Obvioulsy, the amp will power them, so is it necessary to re-wire the entire car with bigger gauge wire for these particular speakers? If so, how does one go about re-wiring a Mustang? Any online links that show step by step process?