Technically it’s not ballast, it’s a spare; the decorative components on the face of the wheel are both welded and bolted to the wheel itself, so it’s all one unit. Therefore, it complies with rule 9.2.2 pertaining to the addition of weight:
“A car found to be underweight after a qualifying session shall (3.1) have securely mounted ballast installed in the passenger compartment to meet the minimum weight requirement without exceeding the maximum ballast weight allowed. Alternatively, a spare tire may (3.1) be placed in the spare tire well and appropriately secured.”
As for the matter of it being appropriately secured, the spare has two big hoking 1/2-inch carriage bolts going through the lug holes and the floor (plus big washers) in addition to the stock spare mounting point. Safety first!
This is my overt way of regaining the nearly 50 pounds in axle weight we lost upon removal of the trunk’s sound insulation to clean up some rust. Since these cars are nose heavy already, adding more weight to the passenger footwell wouldn’t do us a lick of good, and it sucks to be effectively penalized for cleaning the car’s interior. If the ballast rules are going to be so restrictive, we’re going to have to get creative to meet the minimum weight and stay (theoretically, at least) competitive.
There are a dozen ways we could have achieved the same result covertly, from adding sand or water to the spare to filling the rear downtubes of the cage with lead shot, but why be sneaky when you can be blatant and comical. All you naysayers are just jealous of our super sweet bling-tastic Chromepocalypse!