Stereo & Electronics - Stock Subwoofer wiring-->Aftermarket subs

Quick question... I am replacing the factory rear subs with single coil Kickers and was wodering what would happen If I bridged the two power wires together, and negatives into the single coil?

Factory rear subs? You mean the 6 1/2" Mid-bass speakers in the sail panels? Those aren't really subs. But pretty much all factory wiring should be replaced when adding aftermartket stuff. Especially if you are amplifying the new speakers.

What would happen? Nothin... Get more power if anything. Many people do that with their amps in car and home audio.