i cant do the 15" thats overkill for me.....i wouldnt mind having 1 12" though......and the factory BOSE sub will be hard to rig up out of the harness it has and its designed to fit in the spare tire...i think i am going to keep it so when i trade the car i can take all the aftermarket stuff out and keep it......then replace all the OEM BOSE shit.....