[foreman lover]

You will have enough clearance to run them. I have that setup and I only rub on big bumps and at full turn. As chevync20 said also look into the exhaust, I had the same prob he did, bogged without the exhaust put one on and now it doesnt bog as bad anymore. I have the ITP c series on mine. I think I spent right around $700.00 rims and tires delivered. Dont remember from where though. I have some pics in my sig.

 

[foreman lover]

If you put them on stock wheels you are almost gauranteed to rub unless you run spacers too. The stock wheels just dont have the offset to accept such a wide tire without rubbing the front shock, and exhaust in the rear. As for power you will be able to turn them good on a stock 450 until you get into some real thick goo, the 500 will do it even better obviously. To run these tire with out ANY problems I would highly recomend that you get a lift, pipe, filter, bigger jet, and a clutch kit (raises the clutch engaugement by 500 rpm) to put the power band right where you need it to really sling some mud. With these mods the foreman is a totally different bike. You will not be disappointed with these mods.