Update on my hi-five....
I was using the factory 19p SS getting 52 mph (gps) max at WOT RPM with just the GF and 1/2 gas. With the 21p hi-five, was able to hit 48 mph (gps) with 3 pass and full fuel. Hole shot was better, as well as turning and no cavitation. Most importantly, I was able to maintain the low speed (18-22 mph) much more easily. Seems like a worth while investment to improve the low end, without really sacrificing top-end.
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Walt B
"Debt-Charged"Black '07 H210SS6.2L Bravo One turning a 21P HIFive
Wakeboard Tower with Perfect Pass Stargazer version
Missouri River; Kansas City, Mo.