So if it's a direct swap for a 335 I think it works for 328/325. You would just need to include the rotor, pads, and backing plate. If you're going for looks, the BMW Performance/ 135i calipers look good, but for actual performance, that calipers aren't the best. The 335 rotor is larger and has a much larger swept area.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here!
| Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors