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depends on what you consider "optimal bass performance"....using the airspace would most likely increase in midbass volume, but would most certainly sacrifice sound quality..... many woofers are designed for a moderate-to-limited sized airspace, which helps control the travel of the cone and creates tightness in the sound... opening things up into an "infinite baffle (IB)" type of setup will create distortion at loud volumes in many loudspeakers, unless they are deigned for IB application (those that are, are usually advertised as such).
Just something to consider, although most car manufacturers (actually not sure about our bmws, and i do doubt they intended to create a sealed enclosure using weatherproofing) don't take this into consideration and most often mount door speakers without a sealed or properly ported enclosure. People who install high end audio aftermarket in their cars, usually opt for a sealed or ported custom fiberglass enclosure even for their front mid-bass woofers...
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