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Yep, performance differences are engine related. Motor mounts, tune, auxiliary oil cooler (need to check if the PNs match with the sport package 335i), auxiliary radiator, upgraded radiator fan, and exhaust (mostly sound). If I forgot something someone let me know.
All that being said, I do love the beast and highly recommend one. While the chassis can definitely handle more power, once you push her you'll find that suspension work is required to cure the "safe" understeer the lawyers require. As with any other E9X, M3 kit from GetBMWParts, coilovers (I'm leaning Ohlins R&T), and LSD transform the car though.
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