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    1. 1

    Audi A3/S3/RS3 Transmission TCU Upgrade

    APR's Performance Lineup for Audi A3, S3, and RS3 vehicles.

    Transform your vehicle with our Transmission Control Unit (TCU) Software Upgrades. We optimize the factory transmission management system to take full advantage of the transmission's capabilities for large leaps in performance, along with added features to make the driving experience more exciting.