I personally think they look a lot better with the diffusers on. The diffusers make it look like one large unit and hark back to the look of classic 911 headlights. Without it (or the Xenon upgrades) it looks a bit cheap.
Side note, the half dozen headlights I've opened up here in Aus all have only a half diffuser, the bottom half is open and the ridged lines on the bottom of the inner bowl 'cover up' the gap visually, quite clever design. Not sure if that helps with the heat... probably not as they were mostly yellowed as well.
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