Last dyno I saw was 260 hp 280 ft/lbs for tune only on the N20, but don't forget it has the 8 speed automatic which helps acceleration a fair bit and the 4 cylinder weighs a bit less.
Smoke a 335i, not really, run with a stock one - should be right there!
2008 E93 335i, MHD, HPF IC, Injen Intake
2016 X5 M-sport 35i JB Stage 1
2013 Mercedes C63 AMG ROW airboxes, power pipe, Eurocharged V6 Flame tune 540 HP