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OS Giken is discontinued. They had to spec an undersized unit for the E46 because the case is so narrow. That ended up being a bad idea.
Jim Blanton (Performance Gearing) and Dan ( Diffsonline) will sell LSDs but only Jim will let you do the install and setup. I have dealt with Jim a lot and he is very quick and reliable. I've bought parts from Dan (crush sleeves and a set of gears way back) and he's fine too.
Here is the deal. I would not put a helical in my car for the street. I thought the wavetrac would be a "best of both worlds" thing but what I'm hearing is they aren't great. They end up acting like an open diff in about the same conditions as a helical.
The clutch type diffs should never make pinion or gear noise. That is purely setup error. Going down the road straight or around turns at speed you will never hear it. Clutch type diffs will make noise in tight parking lot maneuvers at low speeds. First, you'll hear the inside tire skidding as the clutch plates are trying to equalize the speed of the rear tires. Second, you may sometimes hear the clutches clunk a bit. Both of these noises can be minimized but not eliminated if you want the LSD to actually work.
Clutch noise gets worse the more static preload the diff has. I had Jim build my diff with 90lb-ft of preload and I run Redline shockproof oil with no additive... super thick gear oil. The MFactory diffs will have much less preload than that. I'll also put some friction modifier in the fluid to reduce the clutch noise and we'll run Redline 75/90 standard fluid which is thinner.
I'm happy to put a Blanton diff in there, but it's double the price of the MFactory unit and I don't think you'd be any more happy with it than the MFactory. The MFactory set up as a 1.0-way diff should be similar to Nick's 30/90 ramp diff. A 30 degree ramp on acceleration and a 90 degree ramp (it's probably like 85 degrees in reality) means it'll lock up very hard on acceleration and be almost entirely open on decel, which is great for a street car or autocross car.
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