You'd get a different sound for sure but you'd gain next to nothing in power. You need to change the midpipes out at minimum. LTs for the best exhaust power add.
Current: MGW-p, H-pipe, SS OTRCAI, Lovell rear springs, Eliminator shocks and Pioneer AVH-P3300BT, JBA LTs+catless mids, Drilled/Slotted rotors, Kooks Afterburners, catch can & Tune Next: ??? Wish list: Intake & TB, modest cam, UDP, gears