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Thanks for the input.

I have a 25' Shockwave with a 500 EFI, most of my boating is at a lake that is at 7000' elevation, the engine runs fine except that I am only able to get about 4500 rpm's at WOT with a 24" bravo 1 prop. at Havasu I can run a 25" prop and get 5100 rpm's. would changing out the throttle body to...

Thanks for the info...

I have a Mercury Racing 500 EFI engine in my boat. I can only get 88 octane - no ethanol at the gas station close to the lake where I use the boat, should I use an octane booster ?

Is this boat still available?