The only problem you are probably going to have is clearance for the bigger size prop. If the 17 or 18 fit with no ground clearance problem then I say have at it. The only other problem is that on the specs it states that the prop range is 16x8-16x12 or 17x8-17x12( that thing is going to haul butt with those props ) so if you put a 16x6 or 17x6 it might not be enough and the RPM's will probably be to high. I would say if you are going to do a 6 pitch then go with a 18x6, but there might be ground clearance issues.

Hope that helps.