I've been looking for a locker for a long time for my C200K but I can't afford to swing 1500 for the ARB. the powertrax had a terrible review.
A swap with the m226 is limited, got to find one with 3.133 gears and a locker to get the best value, and those range around 700 bucks.

Then I found this site

http://www.tractionconcepts.com/Product ... =TCXNI6650

They have LSDS for the C200K and R180 and they're 350 a piece. If there's a lot of interest, I'll contact them about a group buy.

I know that this is still not a locker, but it is a massive improvement over open diffs.