I have a 2003 xterra I bought from the local nissan dealership, it came with oversized michelin tires, since Ive had it I have had problems with the tires squealing in turns, and grabbing really hard, to the point where I cant get it out of the turn without a real fight, almost causing me to get into accidents, Id like to know if anyone else has had this problem or where I may get information and stats on this issue

that'd be an issue with the tires. best bet is probably just to replace them.

being oversized alone will not cause the problems you list.

What size are they?

when you say 'grabbing really hard in a turn", can you provide more of an explanation? Are they rubbing inside the fenderwells? What air pressure are you running?

Is your power steering working properly?