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Check out E90post, N54 engine section. You'll find all the help you'll need over there.
Keys items. JB4, Cobb, MHD are all for tuning. To reach the goal you want, 400hp, you'll also need some other mods such as FMIC (front mount intercooler), chargepipe, downpipes, panel air filter, and some decent gas.
With all the above you'll be considered full bolt on, or FBO.
Once you're at that level, and still need more power you can give custom tuners like Wedge, or PTF a call…
GL!
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