ITP Mud lite XL 27″ or 28″ on Sportsman SP 570 -17?

Hi, I'm new to the board.
Hoping to get some good answers here :)
So, this summer I bought a Sportsman 570 SP -17.
It has the McPerson struts in the front (European model, US might have dual a-arms)?

I'm now looking to upgrade my tires. Machine comes stock with 26" tires on 14" rims.
A friend of mine recommended the ITP Mud lite XL, and now I'm wondering if I should go with the 27" or the 28"?
When I read online, people are saying ITP-tires seems to be a size smaller than other tires.
Will 28x10-14 and 28x12-14 fit on my stock 570 Except for spacers in the front.
I'm worrying about rubbing in the back against the footwell/fender.
Or should I go with the 27x10-14 and 27x12-14 instead?

Best regards!

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Please help,
I have a 2012 Sportsman 500 HO Touring, a few months ago it started making a loud turbo sound out of the snorkels in low gear. Recently it started popping out of gear, it goes into gear smoothly but under a little bit of throttle it disengages. The output gear 91T was loose which I think is the reason for the whine in low gear but I do not see a reason of the low gear to pop out. I can take pictures if they are needed just wanted some feed back. I do plan on installing the EPI mudder clutch in since I think the tires caused most of my problems.

Thanks,
-Johnny

2012 Sportsman 500 HO Touring
Snorkeled
Razorback Relocator
2" Lift
27" Mega Mayhems