TRUBENDZ 04-08 Pontiac Grand Prix Dual Exhaust Tubing System $170.00 WALKER 17666 Dynomax Super Turbo Direct Fit Muffler RIGHT $69.99 WALKER 17667 Dynomax Super Turbo Direct Fit Muffler LEFT $69.99 WALKER 21569 Exhaust Resonator and Pipe Assembly $42.79
all of those are the 2.5" pieces, including the OEM replacement resonator assembly.