I am using it on my 1JZ. It is an excellent turbo.
The only reason I am thinking about changing turbos, is if I decide to go for 1,000rwhp or not.
Reid said a big shot of nitrous will make 1,000 but I am concerned with over spinning the turbo.
6466 turbos maxed out, should yield 800-900+rwhp on any engine really.