280 cat set-ups
 

I got the drive spacer cheap and i figured I would try it to see how it would work before buying another drive ,standard or shorter .the maiximus seems to work ok but I think the b1 should work better ? thanks dean. by my guestamation on the slip calculator it looks like slip went down from 22 to 19 with this prop, but I think when merc labbed this prop last year with the 575 they cut the diameter down to much

I think the spacer will slow you down, my boat seems to like the drive high and my slip #'s are below 10.