Ive rung up a few mitsubishi service dealers trying to find out about if it can be done. All of them have laughed when i mentioned a LSD and magna in the same sentence.

What is involved in changing it over to one? how much would i be looking at price wise?

Funny that they would laugh.. the manual Ralliart magna has a factory LSD!

Dave from RPW (http://www.rpw.com.au) can source you an LSD.

Avoid Mitsubishi with this one...

There are also a number of transmission specialists than can get these for you. To my knowledge cusco is the only one i've heard of anyone using and there are a few places in perth that can get them in for you.

Try the transmission specialists in you area along with RPW.