for 400whp and decently low lag, id suggest looking into a gt2871r. i've been told by a lot of people that its a good setup for that amount of power, but if you want to go higher later, you'll probably have to replace it. I have no personal experience with it, im just giving you the info that was given to me by a few different people.
that said, i've driven an fd3s with a monster turbo and it didnt build boost until 4500 rpms and was not very much fun on the street, sure it had power, but once boost built it turned into a missile. it was also a drift car and would just be in the power most of the time.
Really think about what you're doing with this thing. My subaru legacy gt (detuned sti motor) builds boost almost instantly if i get on it which makes it a blast on the street.
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