The Chrysler Aspen 4.7 V8 234hp (2004 - 2009) produces 234bhp and 393Nm in standard form. Our Stage 1 ECU tuning file raises output to 255bhp and 415Nm, a gain of 21bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.