I think you misunderstood. This is what was on the Polaris website.

New - Trail Boss 330 Features
NEW Polaris 330 engine with fan-assist oil cooler boosts peak horsepower by 10%.
NEW Front and rear racks for greater carrying capacity.
NEW Front bumper for extra protection and a great new look.
World’s best-selling automatic transmission (PVT), with a new, spliceless belt for 5 times longer life, and exclusive, lifetime limited belt warranty.
Reliable, low-maintenance Concentric Drive System.
Tight-turning MacPherson strut long-travel (6.7") front suspension.
Long-travel (9.0") rear suspension.

10% more power not 10 hp

 

i hear people all the time that think that you cant achieve more horsepower without more displacement . well guess what , when polaris made the 500ho , they stayed the same displacement but went with a hotter cam and larger carbs to achieve a 25% gain in horsepower . so in comparison a 10% gain in horsepower with a gain in displacement was not to hard to accomplish .

 

I think before stevieD tells people they are full of **** he needs to pull his head out so he can read the post better.