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An N55 powertrain is far from any "limiting" factor aside from it's stock form, which IMO is still very good. Tuning potential lies in the owners willingness to invest into performance add-ons.
It's simple with turbo engines,
Intake, DP, Intercooler and Tune. Anything more is usually above and beyond what most would do to their somewhat brand new cars. Weather an N54,N55 or B58, the same mods will still apply (aside from the AWIC in the B58), so the limiting factor is really in the owners hands. From what I've gathered, the N55 is a powerhouse for the little $ in upgrades. And from what's been said, the "reliability" factor is still pretty good for a "FBO" car.
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