cattitude just set me up and i'm sending my ecu's to dustin to recalibrate and send me the pulley, and thermostat kit. I feel very comfortable with both dustin and cattitude. he has treated me very fairly and i know its worked well on his boat. just wondered if anyone else have done this upgrade on the 575sci's. also running a bravo 1 26 pitch prop. anyone know what pitch i would need in the new 5 blade houston prop after the 100 hp increase and rev limit up to 5600.

Where are you now with the 26" at WOT? You will probably need a 28". I would use the 26" and see where you are with it first.

I agree....other wise your shooting at a moving target.
The 26's might still be good if your at 5200 now.