I gather that the 5spd and auto GTs have different part numbers for the mufflers. I have 3 sets of mufflers, when I converted my V6 to a GT exhaust I just grabbed a L and R muffler and bolted them on.

Now Im wondering if I mismatched the mufflers. Can anyone post the 4 part numbers for the GT mufflers?

 

Manual Transmission cars get a GOG code on the sticker on the muffler, Auto cars get AOA code. Supposedly the manual ones are louder/deeper.