Shop By Brand APR Engine & Transmission Tuning (ECU/TCU Software) for Audi S4 Vehicles

USP Motorsports, with the help of APR, we have come up with an at home tuning solution. With the purchase of this hardware package, plus the software application to your vehicle, you can flash your car with APR software. With the assistance of a USP tech, we guide you through the complete steps to getting your Stage tunes in under an hour. Once this hardware package arrives at your doorstep, you will be scheduled to meet with our tech remotely to complete the process.If you don't see your vehicle listed and APR has a tune available, please contact us and we will add it up for you!