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The electronic wastegate turbos in the I think '14 and up n55 cars have a bigger turbo (similar to the size of the pure stage 1 from what I understand) so that's the difference there.
To get past 400whp your going to need a turbo upgrade. pure stage 1 should get you there for about 1k in parts, but the pure stage 2 is the way to go. It should net you about 425-450 on pump gas With supporting mods, and has a bit more potential when your ready for more power.
Also with the DCT I highly recommend ditching the jb4 for a custom MHD flash... I recently did and there is night and day difference in shifting/drivability.
I'm currently in the tuning process with my Dct car w/ full bolt on and ps2 and I can tell you the car feels like a rocket
Hope that helps! Good luck
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