My best buddy and I used to run a lot of offshore Poker Runs with his 35' Fountain power boat. It had twin Mercury Racing I/O 525 h.p. motors in it that sounded exactly like your cammed tune. I love it! BTW, the boat would run 107 m.p.h.. Not bad for naturally aspirated motors in a V-bottom boat. Thanks for sharing.
2014 GT 5.0 Premium
(Ordered 2/1/2013, received 3/20/2013) 6A - 401A premium trim - Steeda CAI - (Mike Rousch) SCT Dynojet custom tune - Lethal offroad H-pipe - J&M LCA's - BMR relocation brackets - Circle D 5C converter - DSS aluminum drive shaft - front sway bar delete kit - stock mufflers -
and a stock 3:15 gear. Best pass so far - 60 ft. 1.577, 1/4 mile e.t. 11.567, mph 117.22.
(Traded in on new 2014) 2011 GT 5.0 Premium
- Black - 6M - 3:73 gear