Test mules

So, I was hangin' in the right lane when a flat black boxster flew past me. It looked like it was held togather with tape, and I was just commenting on it to my wife, when a second identically taped one flew past. Had I been in mine, instead of my SUV, I would have tried to catch them. The only thing that stood out from the quick glimpse was different tail lights. They looked life aftermarket ricers, completely covered in black except for three circular cutouts for the lights. That part might have been camouflage, but it looked alright.
Also, it might have been my imagination, but the front and rear fenders seemed to bulge a bit more than the current ones. Sorry, no pix. Sort of cool living this close to Stuttgart, though!

I presume you have seen the spy shots, much as you describe.