Solas SD-CD-13/21 Concord Sea Doo impeller has unique blade design that delivers remarkable thrust take off, improves acceleration and top speed 2+mph. Solas sd-cd-13/21 SeaDoo impeller is great for pulling skiers to race. This upgrade over stock Impeller Fits Sea Doo XP 93-94, GTX 94-95, SPX 94-95