The Bosch Fuel Injector Kit - 140663 is a comprehensive set of products specifically designed for servicing the fuel injector system of a car. This kit includes various components such as fuel injectors, o-rings, seals, and other necessary parts to effectively clean and maintain the fuel injectors. The kit is designed to be compatible with a wide range of car models and ensures efficient and optimal performance of the fuel injector system. It is an essential kit for any car owner or mechanic looking to improve the fuel efficiency and overall functioning of a vehicle.