still, d-series goes with d-series... unless you go crazy and try to jb weld a b to it!
even with 5 spd, give those people (protorque and levelten) a call. If they can't help you, they WILL know who can!
Oh, there's always mods you can do to your existing tranny, like the lightened flywheel. Helps out tremendously.
OR the act clutch, phantom lsd, and even a short-shifter is what i'd add!