I have installed Vance & Hines Straight Shots on my 05 C90T. V&H does not actually list this system for use on this motorcycle, but it will fit if you put longer stud bolts on (warning: factory stud bolts are very hard to remove). This made the motorcycle very loud! The other day I replaced the baffles with V&H quiet baffles. Once again I am going against V&H recommendations. They donĀ“t actually list these baffles for use in the Straight Shots, maybe because they are made for 2.5\