WIR is my home track. i grew up there as a kid, but havent been there for a good 5-7 years.
however, on topic, pushing 350+ whp with an m90 setup is far and few between. if you are pushing that much power, then there is no way in hell youll rock 400 unless you spray. you have to have a stupid big build (AKA, giant waste of money) to run near 400 whp with an m90 setup. that is why most dudes ditch it and go turbo much before they hit that wall.
either way, im not doubting you since i have seen you on clubgp and i know you bought a car with an XPZ setup, but i just think its false advertising to say that you can push 400 whp with it. if that car didnt go low 12s then i would be very disappointed with the amount of money that is in it.