I'd highly recommend taking the LSD apart and putting everything back together CORRECTLY. OBX LSD's are put together hastily and have a lot of problems unless properly assembled/torqued (which they arent from OBX). Look on Honda-Tech, there is a writeup on how to assemble it the right way.

As for installations, I couldn't tell you. Custom Care Care in Yorktown/Newport News maybe? I've heard nothing but good stuff about Abacus in VB, but I don't know if they'd install the LSD for you (not sure what work they do other than machine work).