I don't. ...31 lb/min means roughly 310 crank hp potential with this turbo setup...
Also, I'd like to know how much boost that vf39 was pushing. A vf39 flows more air and therefore should make more power with similar boost. I'm guessing the vf39 is either low boost or a crap tune like Cobb's ots accessport map.
And for that other guy, an ewg won't help spool much but would definitely help the top end with this tiny turbine housing.
My thoughts on this turbo are that if you just want ridiculous spool on your 2.0 and make more power than the stock turbo, like at a tight autocross course per say, then this is a good option. However, a small 16g would be a better street turbo IMO. It would still spool faster than you would possibly need it to, it would have more top end potential, the larger exhaust housing/wheel would provide just a touch better fuel efficiency, and you can get one for $699 brand new.