if you're expecting to work on making it fit, and also expecting possible leaks either upon installation or further down the road, go for it.

if not, save your money, spend a lil more, and do it right (meaning buy the quaife).

IIRC, bullett had to grind (for the axle splines), install, remove, grind more, finally fit, then leaked later. FYI he's not the only one with these experiences.

Prep services are great, yes, but you can't fix the crap tolerances for a PnP install w/ out leaks from the axle splines/shaft/c-clip(s). This has been discussed plenty of times. Search for this LSD on the wiki and on the forums and you'll find plenty of readings. READ IT ALL FIRST before you decide its 'totally awesome' lol

my .02 Good luck!