K7 VCT is right that it is missing the airbox that is standard on a VCT (variable cam timing) engined Academy car. This may be because it raced in the Sigma class of the Caterham Graduates which, a few years ago, catered for both VCT and the earlier non-VCT engines. To equal up performance, the VCT cars had a higher minimum weight and had to to replace the airbox with the setup seen on this car.
It looks like a nice car but I would ask PT to put an airbox on it to put it back to its original Academy spec and make sure you don't miss out on a couple of BHP.