Solas SD-CD-15/23 Concord SeaDoo impeller has unique blade design that delivers remarkable thrust take off, improves acceleration and top speed 2+mph. Solas sd-cd-15/23 Sea Doo impeller is great for pulling skiers to race. This upgrade over stock Sea Doo Impeller fits: GSX 96-97, SPX 97-99, Sea Doo GTX 96-97, GSX 96-97, SPX 97-99, XP 96-97, XP 800 95-97, XP 787 95-97, XP 785 95-97, XP 780 95-97. Boat Sea Doo Challenger 1800 2x780cc/800cc 97-99