I have a 2001 Malibu Response with a 325hp EFI Monsoon.
Purchased last summer. It came with a 4 blade 13x13 prop. Not CNC.
Swapped it out immediately for a Acme 515 (13x12) CNC 3 blade.
Improved grunt, smoothness, top end went from 45mph to 47mph at 4900 rpm and my RPM at 34 MPH dropped by 150 to put me in that 3500 rpm sweet spot while pulling a skier. Turns about 3425-3450 rpm while cruising 34 mph without a skier. Am near sea level (if high altitude you may want the 525, 13x11.5) and can say this was a step up and the right move for my particular set up. What JT said is truth. Today's CNC 3 blades are awesome. No need to go 4 blade to get performance...my experience. Couldn't be happier.