You can order the side vents on any 5-series for an extra $300. I don't know about the 3-series, however.
2006 330i Monaco Blue | Grey | Walnut
...Manual | Sports | Premium | Cold | Nav | Comfort Access | PDC | Sirius | Sunshade
...M-Tec Steering Wheel | M-Tec Shifter | TLC
...Performance Center Delivery | Oct 14, 2005