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Moving to the rear of the car, the wing mounts exhibit an aero profile similar to those used on the M3 to reduce drag. The wing mounts have two sets of lower mounting holes to move the wing fore and aft. The carbon fiber wing has a built-in gurney flap which I assume is mandatory. The endplates have angle adjustability built-in which I’d guess is to keep the ‘PUMA’ logo horizontal as the angle of the wing is changed. We can’t have crooked stickers on the car now can we?
The rear wing chassis mounts serve a dual purpose as the alignment rig also attaches to them. Even the wing mount itself has a bit of fore/aft adjustability. Of course, the mounts are solidly attached to the chassis with those robust looking steel tubes. Heck, there’s even a gusset on the ‘X’ to add strength. Check out the structural node at the top of the rear shock tower where all the cage elements come together. I’m going to say that’s a pretty well fortified spot.
The rear alignment rig/jig is freakin sweet. It even looks to have handles built-in for easy handling. My guess is it was CNC machined from a chunk of aluminum and then anodized.
It seems the car spent a fair amount of time in wind tunnel development and these sculpted rear fenders are probably a result. It’s not very production car-like, but the Z4 doesn’t come with a 4.4L V8 off the showroom floor either.
Big cutouts in corners of the rear bumper help evacuate air from behind the rear tires. The exhaust dumps out on top of the rear splitter of the Z4.
