In a development cycle that doesn't seem to end, new spy photos reveal camouflaged examples of the BMW Z4 and Toyota Supra enduring even more testing. We welcome any opportunity to see this pair together, though, especially in photos as good as these. 

This Z4 features a different front spoiler and shinier grille mesh than the test mule in spy shots we saw just a few days ago (compare them below). The changes make an already attractive vehicle look even better thanks to the addition of aggressive bodywork that makes even a test prototype look fast.

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BMW Z4 Spy Shots
2018 BMW Z4 spy photo

The Z4 also has production-spec headlights but camouflage hides the upper corners of them. The units look a lot like the ones we saw on last year's Z4 Concept, except for rounder edges.

BMW's camouflage hides most of the design details along the side of the Z4. Looking closely, there are a pair of creases that start just behind the front wing and run up the side of the car. They create a scalloped area in which the door handle sits.

These shots provide a fantastic opportunity to get a good look at the rear end of Z4 and Supra side by side. The BMW is the more understated member of the pair. It features simple, L-shaped LED taillights and trapezoidal exhaust tips. The most aggressive details are the big, vertical outlets behind each wheel. 

Conversely, the Supra features a far more adventurous design approach. A double-bubble roof gives way to rear glass that tapers inward, which accentuates the wide rear wings. A massive ducktail spoiler sits on the rear. Two big, circular exhausts emerge from the bottom of the bumper.

Check out the cars in our gallery below while we wait for the Z4 and Toyota to finally be revealed towards the end of 2018/early 2019.

Gallery: BMW Z4 Toyota Supra Spy Shots