I have the Dynomax X-pipe and Mid-pipes. I did not have any fitting issues and it was a breeze putting them on. The x-pipe was the hardest only because I had to cut out my y-pipe and it was my first time doing something like that at the time.
2005 V6 Satin Silver Mustang MODS:
Dual Exhaust w/X-pipe and PYPES BOMB exhaust w/FRPP cutouts, Shorty Headers, Tunable Induction CAI, BAMA 93 Race Tune, Coil Pack w/JBA Power Cables, Iridium Spark Plugs, 3.73 Gears w/T-Loc, Short Throw Shift Block w/poly bushings, Tokico Shocks and Struts, FRPP Lowering Springs, Steeda Camber Plates, UMI Lower Control Arms w/CHE Brackets, GT Anti-Swaybars, Project Headlights w/Splitters, Clear Corners, Blackout Grills w/Emblem, FanBlade Rims