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Order This File Ask a QuestionThe Volkswagen Phaeton 4.2 V8 335hp (All) produces 335bhp and 430Nm in standard form. Our Stage 1 ECU tuning file raises output to 355bhp and 455Nm, a gain of 20bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.