I would say the Stage 3 should reach that goal. I've seen a well built S4 T2 on a S5 turbo make 298whp w/ a streetport and standalone at 14psi. I believe he ported the WG and had the trim on the cold side of the turbo setup differently though by majestic turbo way back in the day...
I think what MIGHT hold you back is more of the ECU and not the Stage 3 turbo.. be sure to run a full 3" or better exhaust and port that WG!
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