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    1. 1

    Audi A4/S4/RS4 Transmission TCU Upgrade

    APR's Performance Lineup for Audi A4, S4, and RS4 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.