The Mercedes SLK 200 K 184hp (R171 - 2004 - 2010) produces 184bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 205bhp and 300Nm, a gain of 21bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.