trying to replace the wheel bearing on my 2012, looks like a key way on the axle, but don't see anything in it, so I got about two turns on it and it just froze, heated with mapp gas multiple times and still nothing, broke a 1/2 inch breaker bar on it...any suggestions, ready to get the plasma out....
Front or an AWD rear? Can't imagine busting a 1/2" breaker bar on anything bolted to or in a Kizashi...sure you're loosening and not tightening? Still can't imagine busting a tool on an axle nut unless it's Harbor Freight.
Sometimes on wheel bearings there's a washer installed behind the nut interlocked w/ the keyway and then a tab or two on the washer's OD that get bent up to lock the nut in place. You'd have noticed it, and, I don't see any of those in the parts catalog breakdown for the front or AWD rear.
The only time I'd ever had trouble getting a nut of that sort off anything was because someone must have pounded the end of a pinion shaft w/ a steel hammer at some point in its life. Unperceivably mushrooming it. Couple turns, not even, and it got extremely tight. Had to work it out gradually back-n-forth with tons of PB Blaster and a lot of time. The PB was for lubing and cooling. Totally bitched the nut up (replaceable), pinion threads had to be chased at a machine shop as we didn't have the proper die. You may have screwed yourself by heating it, cooking any grease residue in the fine threads. Cooked, sticky axle/bearing grease acts like carbon buildup. Not a good thing in fine pitch threads.
I'd put the plasma away unless you've got a bunch of hard to come by components lying around to replace the destruction.
Your axle nut p/n is 43459-65J00 (same # for both front and rear AWD).