2009 m90. Looking for mods to improve performance. Kn does not make an air filter so I cut apart a new kn and cut apart the existing filters and only thing I found that would glue things together and hold was superfast urethane. Put on cobra slashdown exaust. Put on power commander five module. Then bought the autotune module and welded in bung/ installed o2 sensor. Did not want to get into any motor machining. Overall I am disappointed with the performance. I am second guessing whether after these mods I have really gained much in performance from buying it new from the dealer. I do reallylove the looks, ride and how it handles and it is a bigger.heavier bike. But in my opinion seems to b a slug for what I was hoping for. Any suggestions would b appreciated. Thanks. Rich.