One thing to think about is that upgrading the turbo on the n55 is considerably less money and simpler to install then the N54.
I know you said fbo, but in the future if you decide you want more power, the pure stage 1 will get you around 400whp for under a grand, a pure stage 2 can produce 450+ Whp on 93 only, or 500+ with meth or e85. It’s around 2500 with the inlet pipe. The ps2 is the way to go... I have it on my Dct car and it is awesome.
Also I think 450whp in N54 is a bit optimistic with stock turbos, it is possible but the turbos won’t last long
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