I'm almost inclined to say you should gut the other one? Not sure if it would make a big difference but the rate of flow may end up different now. Probably not a big deal but thought I would throw it out there.

Green 96 mystique gs 4cyl mtx 16.9 in the 1/4 mile @102500 miles 95SE in Midnight Red MTX MSDS headers and y-pipe SVT exhaust SVT UIM Optimized se TB. Full pre 98 SVT body kit 15.741 @ 87.73mph :)