I had a MM4600 in mine when I had it and it hauled a$$. Just don't do to many donuts on grass. The tracks kept coming off, too much power.
If you get snow in your area I would definitely get it. Fun factor of 10! Wish I didn't sell it on Ebay. Got a good deal on it from my LHS for $110. He just wanted to get rid of the kit, I had a years worth of dust on it.