I have one, welded, and open.

As for the people that are bitching and complaining. A 2 way is in essence a welded diff. I have had a Nismo 2way mechanical. the best there is, If I dont mind saying, and I rock a welded one now, and guess what, they are the same. The 2way actually made more noise.

AS for the guy autocrossing with a welded, They even let you do that? A real track will not let u run welded or even a 2 way.

In short, if you are drifting, and have the money buy more tires, and weld your open diff. Preferably a s14 Auto.

For track days, or autocross, or time attack, then you need a 1.5 preferably a non viscuos if you can afford one.