While most of the performance parts are available through the KTM Hard Parts catalog at the KTM dealer, there are a lot of aftermarket companies which support this bike. You should go to the "sweet mods and accessories" thread, in the "Technical" section", of this forum and you find a lot. To name just a few: Rotweiller Performance, CJ Design, Rally-Raid, Motominded, Scott's Performance, Zip-Ty Racing, Cox Racing, Bullet Proof Engineering, Touratech, Seat Concepts, FMF, Wings exhaust.