Been a month. Still waiting for "dyno papers" and AP data logs.
While we wait, I encourage OP to go over to mazdaspeed forums board and search very, very hard for real 340-350 whp stock turbo cars, even with E85 fuel. That board is the hangout for the most technical and skilled engine builders and custom tuners on the entire planet for our platform. Search hard and tell us how many 340+ whp engines you can find on stock K04 turbo.
Yet, your buddies have two of these gold unicorns in the same local neighborhood. I need to go down there. Must be something is the air that will give everybody more horsepower than on the rest of the planet. Oh, yes. It's a purple haze with a distinct smell.
I'll buy 330 in the hands of a good MSF tuner on that turbo. Tick, tick, tick.