Skat-Trak’s Honda impeller is recommended with a 3-Blade 16/21 Swirl Cut Back* or 16/22R Swirl** pitch in any 148mm pump. This is recommended for a stock Engine only. If you have modification to the engine and watercraft, please give us a call so that we can recommend you with the correct impeller application. *Suggested for maximum bottom-to-mid range acceleration gains.**Sugested for maximum top speed gains.