yeah I am not getting into long retarded swing arms, messing with the chassis or fork rake. only suspension mod I might make would be a sing sided swing arm, or make my own chromoly arm with factory geometry. The rectangular arm on there looks chintzy for a Duc IMO. Only performance change will be some bad ass straight pipes, let the EFI do its thing and adapt, and/or power commander it to compensate, only if need be.