Boat runs like a tractor

I replaced the fresh water pump on my Universal M-12 yesterday. I opted to by the pump from a Kubota dealer for 107.00 instead of the 300.00 from a marine engine parts seller. I was a little nervous but that was unfounded. Worked like a charm. I hate not to support the marine industry folks but with such a large price difference it is their own fault. The only problem is that when i go by a farm on the lake it wants to pull in that direction