Yes. The oem spoiler is not for aesthetics. The benefit is not an abrupt transition so hard to say at what speed the performance benefit outweighs the weight of the mechanicals.
But as a safety issue I would leave one or the other in place. Particularly if there is any chance that anyone else might ever drive your car at an indiscreet speed and suffer the consequences of lift.
I'd just bolt on a stock lid, leave the spoiler affixed to glass lid so you dont have to remount it later, and add what you need from a scrapyard to have an effective "stock" system. The one 986 I've seen that was thought to have the factory aero kit looked like it had some, if not all, of the mechanicals still in place. But maybe it wasn't truly "factory."
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