So 3 are GXP tips and 1 GT tip?!
Sounds like the factory muffler guys just came back from the bar when they made your muffler!!
09 Liquid Red GXP A6
Go : VMS 93 Tune, ARH 1 7/8" Catted System, RotoFab CAI, HSRK
Handling : Spohn Rear LCAs, Rear Trailing Arms, Rear Toe Links, BMR Rear Cradle Bushing Kit, Sub Frame Connectors, Driveshaft Tunnel Brace
Looks : 5000K Spencer's HIDs, RotoFab radiator cover, Llumar 15% tint, Debadged, Billet Prototypes Catch Can
Electronics : DashHawk, Clifford 50.7x, Valentine V1
353 RWHP STOCK