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Order This File Ask a QuestionThe Jaguar S Type 4.2 V8 R 400hp (All) produces 400bhp and 541Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 565Nm, a gain of 20bhp and 24Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.