My 2000 Tacoma 4x4 extra cab does it have a stock amp in it? If it does where is it located at? Reason being I recently installed a new HU and speakers fronts are RF 5.25's 2 ways and rear speakers which are RF 6.5 two ways. Fronts sound excellent but the rears only bass coming out of them and no high end sound coming out of them. Anybody know if it has a stock amp because I believe this is the problem. I did use the stock wiring harness for the rear speakers. I may need to run speaker wire strictly for rears instead of using factory harness speaker wires. Any info is appreciated.