Something got lost in the translation from Russian to English
El Freddo has an OBX helical that apparently needs to be rebuilt. If you added the cost of the mechanic (thanks to his aknowledge he doesn't need one), then it would be far more expensive than a Quaife.
Cheap is expensive....
Interesting. I note you said your engine has a fairly even torque curve. Perhaps that is where a good part of the explanation lies.
This one is a decently priced aftermarket:
for SUBARU REAR axle gear VA2 R160 Diff Lock ATB LSD VAL | eBay
I haven't heard of anyone who has installed it yet. I am assuming though that since they love their Subarus up there, they get some sort of a following. They cover all Subaru models up to 2018.
I usually just buy Japanese aftermarkets and with the previous non-Subarus, I just went with Cusco and plated LSDs. The one on the link might be worth a try considering that the price is a quarter of that of most branded ones. Cheers.
All subaru models? Is the R160 rear diff size in most everything from, say, 2010-2018?
The R160 has been used since...at least 30 years
I have a Suretrac rear LSD which has been sitting on the shelf now for ages which I had planned to use in my L Series wagon, but do you think I can find a pair of snap-ring stub axles anywhere on this planet?? I have given up. I have contacted every man and his dog, I have advertised wanted ads etc, they are just impossible to find. The rear end of the L series sucks, its all rare & expensive parts for brakes and diffs if you want something better.
As far as i have been able to research, I should even be able to use standard N/A Gen1 liberty stubs as they had them too? But even those cars appear to have really dried up in the last few years. Also seen the odd early GC8 diffs for sale with stub axles poking out of them.