JWT,,,,The P4 is a “different breed of cat”, and will pretty much run any prop you wanna try on it as Phil and I determined last weekend,,,,We settled on a 26p Trophy for overall performance,(Phil really wanted to run a 25p but none were available) and especially carrying the load i carry(both in tackle, and belly),,,,,,, the lift was much better with a much better feel for the rough water, and the engine seems to breathe better, and seems to make horsepower instead of just rpms,,,,,,the Tempest i was running was also a 26p, but seemed to have too much slip @ top end,,,,,,i had alot of help with my set-up with Phil there,,,,and he lowered the engine probably 3/8″ below flush on the plates and helped the torque on the Tempest,,,,,but we both liked the boat better with the Trophy on it, and i can now bump the trim down and drive the boat like youre supposed to be able to,,,,good luck, D.