GMC Sierra Tuning Data

Gains across the GMC Sierra range

• +18 to +55 BHPacross 21 engines with recorded figures
• +55 BHPis the largest gain in the range — 6.6 V8 445hp (+116 Nm)
• 82%of the 9,842 engines we hold gain data for see a smaller increase than that

Comparisons are calculated from our own recorded Stage 1 figures.