For sale is my used Torvec IsoTorque differential. It is a gear differential (think Torsen T2R, etc.) that was used in the car for three seasons of autocross. I decided to move to the OSG diff because it is readily available and better suited to autocross. I believe this diff would be great for high speed road courses as proven by John Henricy with his several SCCA Runoffs Championships using this diff.
Purchased new and installed by Phoenix Performance in Phoenixville, PA. The bearings on the diff were installed new and have three season of autocross and testing on them (well under 1000 miles). Purchase includes the special order ring gear bolts (longer than standard to account for the thicker ring gear flange on the Torvec housing). Purchase does not include installation.
More info on the story of the Torvec development can be found here: http://www.marketwired.com/press-release/torvec-introduces-isotorquer-differential-corvette-aftermarket-partners-with-phoenix-1266486.htm