No one makes a supercharger kit for the N52 engine yet. The M54 yes but not the N52. As of right now there are very few modifications for the N52 engine. There are a few exhaust options, I haven't seen any intake options. You might have to wait for anything substantial. To get to the 300 HP mark you're going to need a lot more then you think. N/A tuning is very expensive for sadly very minimal gains. You're looking at headers, full catback exhaust, intake, and software that should put you close to it but also probably drain a good 3500$ with install.
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