Looking for a torsen and came across this:
http://cgi.ebay.com/ebaymotors/JDM-Miat ... ries#payId
Says its 'used' so I assume its pulled out of a jap spec NB (ie made by mazda?)
Is it risking buying a used torsen? from what I have read they don't seem to wear out like the clutch type lsd.
Also would this be a direct bolt into my existing open diff allowing me to keep the stock ratio? I have never really played around with diffs before so not to sure

cheers