Stereo questions for '02 GT.

I was just wondering if the factory monsoon stereo has preamp outputs on it. If it doesn't, what options do I have for installing a 12" sub without purchasing a new head unit.

thanks

by the way, its a 2002 Grand Am GT.

most amps will have hi and low signal inputs, and there are converters for high input to low( splice into your speaker wires and converter box has rca's at the other end.) you hav ea few options just depends on your preference. converters work ok, ive found they short out if you run alot of power, but are sufficient for good looks. using your existing speaker wires can be tricky if you hav eto bypass the stock amp, but is no big deal.