You will notice a difference..My friends Forman runs 27 zilla's and he has a hard time in the mud.
If you do that..Get a clutch kit.
Then there is something wrong with his Foreman because my Foreman turns 27 Outlaws like they were stock tires.
Foremans are known for their low end torque so something doesn't sound right with his not turning vamps in the mud.
May need a clutch adjustment, or replacement.
My foreman will bog down in 2nd gear, but drop to 1st and hang on.