Just got a 2011 335i Coupe about 4 weeks ago. This is the N55 setup with a single Turbo. This is an animal. 328i was never a thought for me. Reliablity is much better with the N55. Turbo lag is not an issue with boost at 1200rpms.
303hp with 303 lb/ft tourque. This is my favorite, torque forever!
Drive it, its got a great growl, tight, fast and decent gas mileage.
Enjoy!

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Mike F
Current: 2017 Grand Cherokee HEMI
2017 Kawasaki ZX-14r
2017 Harley RG Ultra
2017 Harley Fatboy S