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The search button will yield plenty of results on this topic.
N52 upgrades have been well documented, with headers + tune + 3IM providing the biggest bang for the buck. The rest provide incremental gains. Ditching heavy and oversized wheels will yield favorable results for your vehicle.
Buying a 135i is the best course of action if you're after power. It is prohibitively expensive to motor swap to something that already exists from the factory. But hey - suit yourself, it's your wallet, not mine.
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