DOC #CERT-2D08-065D-10F7
07.09.2026
Performance Report
ECU Chiptuning — Stage 1
Document Date
07.09.2026
GMC Sierra
2008 - 2013 4.8 V8 302hp Petrol
Original
302HP
414 Nm
Stage 1
320HP
435 Nm
+18 HP / +6% +21 Nm / +5%
Estimated Power and Torque Curve
Customer
Chassis
Date
Signature
Stamp
NOTICE: This document represents estimated values based on database information. It is not valid as official certification without the original handwritten signature and physical stamp of the authorized technician. Performance values may vary based on vehicle condition, fuel quality and operating environment.