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Mine came with a K&N from Ticher. I can't remember if I ordered it separately or if it just comes that way from the factory. But the PI reuses half of your stock airbox. The part with the charcoal filter and MAF sensor is reused. Also the air filter is the same. The factory one will fit since it uses one half of the original airbox.
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--Marcelo
'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 |