My 3L has a fin and i had a discusion on another forum about it. Whether it was standard at launch in 1997 i have no idea, my marine engineer told me to take it off, would not give a reason he just said 'trust me'
I have no power steering either.
A reply from a UK forum;
Are you thinking its a standard fit? If so its not its an after market piece of kit to create rear lift to give a faster plain and a lower throttle plain
My Maxum came with hydrofoils fitted and personally I would remove them, throw them in the bin and fit smart tabs. Don't get me wrong I had hydros on my 9ft dingy and they really helped, they even allowed a bath tub type tender to plain with a 2hp outboard. but on our type of boat where you want to trim up to get the best out the boat on the plain, They don't suit
Smart tabs however still give you the lift they reduce wake give better fuel economy easier steering etc but still allow you to use your trim as you should.
Take them off its only 4 bolts, you will defiantly notice the difference, but you will get a greater effect with the smart tabs fitted