Need some tire advice

Looking to replace stock tires on my stock 2016 grizzly 700 and stock 2016 kodiak 700 looking at putting 28" mega mayhems on the grizz and 27" mega mayhems on the Kodiak. My question is is anybody running these tires on stock machines and if so how much of a power loss due to the extra weight. Also goes the stock rim weights compare to the itp steelies weights. I like the look of the itp steel wheels. Thanks for any input.

Need some tire advice

Looking to replace stock tires on my stock 2016 grizzly 700 and stock 2016 kodiak 700 looking at putting 28" mega mayhems on the grizz and 27" mega mayhems on the Kodiak. My question is is anybody running these tires on stock machines and if so how much of a power loss due to the extra weight. Also goes the stock rim weights compare to the itp steelies weights. I like the look of the itp steel wheels. Thanks for any input.