does arizona speed and marine 575sci upgrade kit work?
 

looking at this kit and heard it is pretty good, reliable and does,nt hurt engine. jim out there said it will help with mileage at mid speed. he said i would not have to change props because they raise rev limiter by 400rpm and its not necessary. any experience here?

I don't know anyone that has it but Cattitude had Dustin Whipple do one for his (my old boat) and it was about $600 and he picked up 4-5 mph. You might PM him and get the low down.

I had Jim reprogram my ecu's on my 575's and the motors are running much leaner (no more black soot on the transom) and I am burning less gas. He also had me install an msd box as well. The rev. limiter goes to about 5600. I tried the smaller pulleys but it didn't make enough difference to justify the extra boost at midrange in my opinion. Overall the results were good I would recommend it for the 575's. You would think Mercury should do this!!!

dustin or cattitude
 

anyone know how to get ahold of these guys to see what they recommend

Call me,
I can hook you up!
479 636 4669