19, maybe 21 pitch Merc Tempest Plus, which is a 3 blade prop. I had a 21 Tempest on my 175EFI, but lost about 300 Rpm’s on the top end, switched to a 19, got all my Rpm’s, had great bow lift and control and only lost about 1.5-2 MPH. I’ll take bow lift and control over speed on the top end any day when fishing rough water.