Got the Acme 650 for my old 89 Supra ts6m inboard use only for wake surfing. With stock 3 blade prop it was not turning enough RPM it was only turning 1400rpm @ 9 to 11 mph. Had no real thrust coming from prop. Plus it would struggle to keep at low speed especially if it was headwind. Now with the the Acme 650 the boat has no issues at all including headwinds with speeds and now the RPM is at 2500rpm at the same speed with a lot more energy. Now it's much easier to stay in pocket for wake surfing which is already tough on this type boat. Plus this prop has WAY more power out of hole you better hang on. All vibrations caused by stock prop are now gone. Not sure on the top speed yet but going 0 to 32 mph only takes about 2 to 3 seconds without fat sacks now!