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95 APR Stage 1+ APR Stage 1+ ECU Upgrade $399
The Active Autowerke M340i/M440i rear exhaust was carefully engineered to eliminate the overly quiet sound of the factory M340i and M440i exhaust
Our software delivers a smooth
APR - Performance ECU Software - 4.2L EA824 V8 (RS4) turbo Full directions and APR world-renownedAPR's ECU Upgrades are the best dollar per horsepower modification one can make to improve engine performance. The upgrades dramatically increase horsepower and torque, making for an exceptionally quicker and more exciting vehicle. This is made possible through APR's optimization of the factory engine management system to take full advantage of the engine's capabilities, without needing any end user adjustment. The ECU Upgrades are available with
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