R172 - 2011 ->
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Order This File Ask a QuestionThe Mercedes SLK 55 AMG V8 421hp (R172 - 2011 ->) produces 421bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 440bhp and 565Nm, a gain of 19bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.