GMC offers a diverse engine lineup — approximately 12% diesel and 88% petrol across 60 variants in our database. Both fuel types respond well to Stage 1 remapping, with turbocharged diesel engines typically delivering the largest gains in both power and torque.
Across the GMC range, Stage 1 remap gains typically fall between 3 and 55 BHP (averaging 22 BHP) and 17 to 116 Nm of additional torque (averaging 28 Nm). Turbocharged variants see the largest improvements, while naturally aspirated engines benefit from refined throttle mapping and ignition advance.
A Stage 1 ECU remap optimises your GMC's factory software to unlock its full potential — no hardware changes required. Here are the typical gains across the range.
+3–55 BHP across the range
+17–116 Nm across the range
13% of variants are turbocharged
Software-only — no hardware modifications needed
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