With the E90 generation, the 325 / 328 / 330 all use the same N52 engines. The power difference comes from different ECU tuning as well as some minor hardware differences. Grassroots Motorsports actually has a 328 project on hand where they are doing precisely the needed upgrades to get the car back to 330 power levels:
https://grassrootsmotorsports.com/pr...o-our-e90-bmw/
The car looks clean and the price is attractive. But I have been completely spoiled by Japanese reliability, so I wouldn't dare to venture into something like this even when it looks like a good deal.
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