Designed by RIVA Racing's Development Team this new pump impeller for our 2018+ RXT/GTX 300 Stage 2 Kit produces an additional 2~3mph top speed and +150rpm. This new 159mm pump impeller is an exclusive "R" model and requires installing a smaller 159mm wear ring. This new pump combination is an easy-to-install and cost-effective upgrade for our 2018+ RXT/GTX 300 Stage 2 Kit that will satisfy those looking for more top end speed (+2~3mph) and don’t mind sacrificing some initial acceleration performance (compared to 161mm Solas SXX-CD-13/18).NOTE: For use with 2018 & newer Sea-Doo RXT/GTX 300 models modified to RIVA Stage 2 only. Not recommended for stock craft or any levels of modification other than RIVA Stage 2. Requires replacing 161mm wear ring with 159mm RIVA Stainless Steel Wear Ring or OEM Plastic Wear Ring. Both sold separately. REQUIRED ADD ON: SS Wear Ring, OEM Plastic Wear Ring