The Mercedes SLK 200 K 163hp (R171 - 2004 - 2010) produces 163bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 175bhp and 255Nm, a gain of 12bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.