Is Subaru’s VF45 Turbo Good?

The VF45 turbo was released in the Subaru Legacy GT Spec B out of japan on the Ej20X. What makes the VF45 Special? This turbo is built with a twin scroll design allowing the motor to build boost extremely fast due to the duel independent exhaust ducts leading to the turbine wheel. What is this turbo good for? The VF45 was designed for fuel economy but if you want to tune your car with this turbo it can make up to 400hp. The VF45 is popular in japan but non existent in the US market and only obtainable from importing the jdm ej20x.