Young humanoid decided his original four wheel drive car series was finished at Version 3. However, he decided to make a "super addition" that included special features. The new series expansion was named Four Wheel Drive Car Super Addition, abbreviated FWDCSA. And in this version, those features included front and rear lights, four wheel independent suspension using pneumatics (inspired by teenager101's project super 4X4 dune buggy) and four wheel steering, as well as a two-gear transmission.
Young humanoid soon had to give this version up, as the gears in the transmission slipped.