Any advice on how Maximus 28's might work on a 99 353 Fastec w/HP500's and boxes? The boat is currently running Bravo 4's 30P and getting just about 5000 RPM but a bit disappointing at only 77 MPH on GPS.

With a 17% slip with the current set up, the 28 Maximus props will work wonderful. Labbed to the correct recipe will give you 1-2 on the top and more than a few in the mid range.

We have these props to test with when your ready.

Brett

Thanks I'll be in touch for more details.