Okay, I have a 2006 G6 with the 3.5 engine. I bought a rear valance for a GTP so I can add dual outlet exhaust. Evidently no one sells a replacement muffler for the 3.9 engine, but it appears that Walker sells a muffler (50085 - Quiet Flow SS) that will fit a Chevy Malibu with the 3.6 engine. Does anyone know if this muffler would be a fit for a 2006 G6? What other aftermarket options are there besides going full custom?