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Best-SellerAPRAPR Ultralink Fits Most APR ECU/TCU supported vehicles - Audi / VW / Porsche / Bentley / Lamborghini$184.95
TrendingAPRAPR Throttle Booster - w/ Wireless Controller and Bluetooth Mobile App Fits Various 2004-2025 VW/Audi/Bentley/Lamborghini/Porsche Vehicles$299.95
APRAPR ECU Upgrade - 2.7T EA835 V6 2.7T V6 Engine Tune for the Audi A6 Quattro 00-04, Allroad Quattro 01-05, S4 00-02$559.95- $659.95
- APRAPR ECU Upgrade - 3.0T EA837 V6 (Simos 8.5) 3.0T V6 Engine Tune for the Audi A6 Quattro 12-15, A7 Quattro 12-15, A8 Quattro 13-14, Q5 13-17, S4 13-16, S5 13-17, SQ5 14-17$659.95
- APRAPR ECU Upgrade - 3.0T EA839 V6 (B9) (S4/S5/SQ5) 3.0T V6 Engine Tune for the Audi S4 18-24, S5 18-24, S5 Sportback 18-24, SQ5 18-24, SQ5 Sportback 21-24Part# ECU-30T-EA839-B9In Stock$999.95
- APRAPR ECU Upgrade - 4.2L EA824 V8 4.2L V8 Engine Tune for the Audi A6 Quattro 00-07, A8 Quattro 97-07, Allroad Quattro 04-05, S4 04-07, S6 02-03, S8 01-03; Volkswagen Phaeton 04-06, Touareg 04-06$459.95
APRAPR TCU Upgrade - 8 Speed Tiptronic (AL552 ZF 8HP55) (B9) 8-Speed Transmission Tune for the Audi RS5 18-24, RS5 Sportback 19-24, S4 18-24, S5 18-24, S5 Sportback 18-24, SQ5 18-24, SQ5 Sportback 21-24$649.95- APRAPR TCU Upgrade - 7 Speed DSG and S Tronic (DL501) (MLB) 7-Speed Transmission Tune for the Audi S4 10-16, S5 10-17, S6 13-18, S7 13-18$649.95
Audi S4 Software & Tuning
APR’s software and tuning solutions deliver refined performance engineering—precision ECU and TCU calibrations, along with inline modules, that elevate power, transmission response and driving dynamics while maintaining the integrity of your European vehicle’s factory systems.