Yep. I have the MFactory Helical LSD. It's great. They run sales from time to time. You have to MAKE SURE they send you the right diff. At least two people (me included) had the wrong diff sent to us). They were great and getting the right diff out, but what a pain. Thankfully my car was apart so it wasn't a big issue. If you decide to order, PM me first and I'll give you some contact info to smooth out the order.
Also, rather than the $600 specialty tool to pull the driveshaft nut apart, you can buy the
Tusk 50mm wrench (comes with 2!) for $25 ...
Filippo