This solves the engine debate!

[nedarb2]

Boat is sponsored by a marine company which sells all three manufacturers so they rigged up a boat promoting them!
the Yamaha is a 300 HPDI and the Merc and Evinrude are 250 HP (although they all say 300 for appearance sake). With different props and setup they were able to make it work, and i can imagine the hugest pain in the butt was syncing them!
The boat is a Yellowfin if anyone is wondering, which are very popular out east and are a top-tier boat

 

[Aces]

Yellowfins kick butt

 

[Fish-Hunter]

NICE Rig!!! Holy Sh!#, 800-900HP. How fast does that thing GO?? How big is the Fuel tank(s) on that thing? Sponsored by a Marine company, should be sponsored by a FUEL Company. I'd like to take it for a burn for sure.

 

[Mad Shepherd]

That boat is definitely a head turner. Would like to see a Suzuki as a fourth engine back there! Cant imagine how much time it took to set that all up.

 

[Last Chance]

One has to ask, which to they have in excess the most? Money, or spare time. WTF, I can imagine syncing those damn things.