They have a nice set up. The web site says the 860CRSC will run 54 with a 90 HP 4-stroke.
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I dont think it will make 54mph like the excel is advertised but I would venture to guess it weighs more than that boat does too due to the lay out.
Dont know the speed for sure but would guess mid to upper 40's, might scratch low 50s on slick water and get it trimmed out perfect. I have run a known 12 miles in 16 minutes which works out to 45mph but that wasnt maxed out.