I have a manual transmission 12 335is, but im running some nice bolt ons + stage 2 COBB. Awesome power gains, mods r in my sig. But I would recommend dci and tune to start.
2012 335is Sapphire Black/Red Dakota
COBB Protune | AFE DCI | AWE BOVs | BMS Downpipes | ETS FMIC
If you dont know...