"Mystery" Prototype Testing at Mulholland is the 2015 Subaru WRX - Plus Bonus Footage

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One of the many regular car- and motorcycle-spotters at the infamous Mulholland Drive, just outside of Los Angeles, was on hand to film several passes of what he described as a "Mystery Car".

"Some Mulholland passes from an un-named car," wrote YouTube author 31200MulhollandHwy, adding that, "CHP [California Highway Patrol] closed the road intermittently - Japanese crew wouldn't give any info on car."

What we can tell you for sure is that the "Mystery Car" is in fact a Subaru WRX prototype, as it's the same model our spies photographed and filmed in and around the Nürburgring earlier this year. Whether it's the lame-looking production version of the eye-catching WRX Concept, the WRX/STi version of the current Impreza sedan or a deceptive test mule, remains to be answered.

On another note, while taking a look at 31200MulhollandHwy's other videos from the twisty LA road, we found a few more clips that we believe you will find interesting – if you get what we mean…