You will definitely need HMF, Filter, Jet kit and clutch kit to turn those tires. Teh lift you might get away without getting depending on the clearance, you will need to modify the rear fenders(either with heat gun or shaving some). My 27" swamp witches rub just a little when on the floor boards in the mud pulling the bars.
it looks like your foreman is a S model so you will be able to jam gears and that will help out a little. like said above, a pipe, jet kit, air filter, and clutch kit. i have not rode with a foreman with that big of tires but you are proubly not going to have a ton of power, but you will turn them good enough.
Honda Foreman Forums: Discuss the latest Honda Foreman in our free Honda Foreman forums. Also talk about Honda's other ATV and UTV's including the Honda Rubicon, Honda Rincon, Honda Rancher and Honda Recon