Haha I knew that was coming from you Luke! You were right. I find it interesting that after I had the diff rebuilt with the truetrac it was quiet, but then started doing it after I'd done a few burnouts (on private property, of course)...could I have f#cked something in the diff by being too hard on it too early? Or possibly just the crappy oil they used for the run-in period...which is still in there? After having a good chat with Tim Slako about it I ended up sticking with the option 3+ in the end. As you said, both are great clutches and Tim was convinced the option 5 would be overkill for my application, as well as needing a couple weeks or so to have one built. Plus I'm going snowboarding in Japan in 2 weeks, so the extra money will help with that.