which lsd to buy?

[Topless]

I don't run one but most of the serious, front running track guys I know use Guard.
Limited Slip Differentials | Guard Transmission

Matt Monson is one of the best and he really understands driver needs.

[j.fro]

I've got a Guard torque-biasing diff. No issues, works great for AX. It was a bit pricey, but hey, that's the way it is.

[Paseb]

Originally Posted by j.fro

I've got a Guard torque-biasing diff. No issues, works great for AX. It was a bit pricey, but hey, that's the way it is.

how much did it cost you for the part?

i do my own labor with a friend, not much here