The Mercedes SLK 250 (1.8T) 204hp (R172 - 2011 ->) produces 204bhp and 310Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 380Nm, a gain of 16bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.