My FX 20 came with a 27 T1 on my 250 SHO. I could only turn 5500 rpms in the hot weather. The FXP 26 brought me up to 5900 after I raised the motor 1/2 inch. At 5900 rpms it hit 76 mph with full tanks, tackle and my 240 lb butt. The prop helped a bunch. The hole shot is incredible.