I know this has been hashed over probley more then a few times but i guess seeing i am NOT mechanically inclined. i have a question. I have a 2011 triglide and wanted a lil more sound but not excessive so i bought a pair of V&H slipons.. in the process of putting them on now but with al this talk about replacing the Cat.. is just replacing the slipons going to harm the bike? make it run rougher? or make the gas mileage Decrease rather then increase like soemone told me it should increase abit with these V&H slipons. Again sorry if i am rehashing a subject.. also thanks for any help you can addd. steve