A Feeler of sorts, I can get my hands on a used open diff to just swap out myself and sell the car without it, but I'd rather actually have some real interest before doing that.
So what's for sale is an OS Giken installed 3.46 Final Ring Gear differential from a 2009 Steptronic 135i. I believe they shorthand this unit as "small case".
From what I understand, Berk Technology did use the "small case" diff as a direct swap for their Manual trans Racecar.
So I'd be selling you a complete diff, so you're diff can then be a spare, no swap, no core exchange, just my diff coming to you.
By the Time I pay for the used diff, fluids, freight for that, blood sweat and tears, I'm not really making all that much money back for the OS Giken (I paid 1,850, though I haven't seen that good a deal for the 135i anymore).
VAC has a new Superlock going for 2,074.95. for 2,200, it's installed and freighted to you with no core exchange. I'll be using the freight box that Diffsonline's open diff comes to me in.
This was installed by BMW Technicians, not just garage monkeys (and the special tool just for the install is crazy expensive).
It went through only 6 autocrosses, no track days, no issues, light street miles, mostly 65 mph highway driving in its lifetime. The reason I moved from this project was as simple as falling in love with an e36, and the OSG here for the 1 is not the OSG for the 325is.
I'm hoping you'd want this ready for the spring, I'll need to feel good about your interest, order up the open diff from dan, do the swap, and move out my diff to you. I'm not 100% on how long this will take but I'm hoping to sell my car with an open diff in the early spring, so I'm motivated to make this swift. Hopefully to the tune of within 3-4 weeks of serious interest expressed, I have a crated up OS Giken diff ready to go out (i think Dan gave me a 10-14 day shipping quote on the open diff).
To do a similar non core exchange from VAC is 3500.