Labbed & Cupped them for my boat, I had 26P Bravo 1's before, the boat comes on plane better, mid range is great, and top end is way better!!! It was running at 5100 RPM at WOT witht the 28p props, and with the 26p it was running at 5000 RPM. It was more driving, water conditions and weather I think!!! It ran a consistan 77-78 on the GPS speedo with out a problem!!