Do the Big 3 upgrade (use 4 gauge or 0 gauge wire is recommend, alternator to battery +, battery - to chassis ground, engine block to chassis and a extra battery + to underhood fuse box) I have a Alpine deck 3 RCA preouts (front, rear, subs) I got a 600 watt 4-ch Kenwood amp (50 watt rms x 4) connected to two 240 watt 3-way 6.5" Kenwood in front and two 270 watt 3-way 6x9 Pioneer in back, two 140 watt 2-way 4" Alpine type S connected to the stock Bose amp and two 1200 watt (600 watt rms) 12" Kenwood subs bridged and wired in series to a 1000 watt 2-ch Kenwood amp (500 watt rms bridged x 1) the two Kenwood amps are connected to a 2000 watt 2 farad capacitor my headlights/I.P. don't dim and it's loud/clear and deep bass. If you want to take a look Click my 2000 Grand Prix cardomain link below.