The BorgWarner K03 Turbocharger Kit - 135213 is a comprehensive kit of products designed for use in a car. It includes a variety of components that work together to improve the performance and efficiency of the car's turbocharger system. The kit contains a new turbocharger, as well as various gaskets, seals, and bolts necessary for installation. It also includes an oil feed line and oil return line to ensure proper lubrication of the turbocharger. Additionally, the kit contains an intercooler and piping to help cool the compressed air from the turbocharger before it enters the engine. Other components included in the kit are a blow-off valve, wastegate, and boost controller, which all help regulate the amount of boost pressure produced by the turbocharger. Overall, the BorgWarner K03 Turbocharger Kit - 135213 is a comprehensive and essential kit for optimizing the performance of a car's turbocharger system.