Just got soe vance and hines cruisers and they sound great on my 07 750. Some guy said to watch out for it running poorly as any carburated motorcycle will generally not run as well with them. something about backflow. Seems to run fine and was done by a mechanic at a honda shop and jet kit was installed. is this guy just talkin about nonsense? anyone else out there have any issue with aftermarket pipes on 750's?