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Straight through muffler design
Optimized thermal management with various engine safety protection routines added
4 - Bevel Box Bolt
Our software delivers a smooth
Full directions and APR world-renowned customer support included
APR - Performance ECU Software - 4.2L EA824 V8 (RS4) turbo Straight through muffler designAPR'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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