The tuning box is unused and I am selling because I ordered the wrong box by mistake Enhance the performance of your VW with the TDI Tuning Box CRTD4. This chip tuning device is designed to improve the engine's output and accelerate the vehicle's speed without compromising on its stability. The box comes with wiring harness and original box. The TDI Tuning Box CRTD4 is a perfect fit for those who desire to upgrade their car's performance. It is a reliable and efficient chip tuning device that guarantees to enhance your vehicle's speed and output. This performance part is ideal for those who seek a thrilling driving experience.