Looks like fun trail. Having more power isn't all about speed, acceleration and torque is another benefit of having a bigger, more powerful engine. Say you get into a tight spot and have a slippery, steep hill to climb. Having the extra power to instantly accelerate and charge up the hill is not a bad thing. Even with the 550 engine, it still would fall far short of something like an Outlander 800 in a drag race but would be able to keep up on faster, tight trails just fine I'm sure. Polaris did something similar for a few years putting the 455cc engine in the same chassis as the 299cc Hawkeye. It was even smaller than a 350 Grizzly, more like the size of a 250 Beartracker or Honda Recon. I never rode one but I bet it was a very sporty machine. People do it all the time with full sized vehicles, look at all the Jeep Cjs and Wranglers with small block chevy V8's in them. And many of them are trail vehicles, they want the extra power to turn big tires and better get through and up and over anything they might encounter on the trail.