2024-2026 Duramax Derringer High Output (671XX)

The Banks Derringer High Output boosts your 2024-2026 Duramax 6.6L with more torque for easier towing and climbing. Choose from 6 power modes, including fuel-saving and max power, controlled from the iDash. AutoRate adjusts the tune on the fly using vehicle diagnostics, even compensating for altitude, while ActiveSafety and Transcommand keep the engine and transmission protected.

Part Number: 671XX

Fits: 2024-2026 GMC/Chevrolet 2500/3500 L5P 6.6L Duramax

• Adds up to 86 hp & 178 lb-ft at the wheels
• 6 power levels changed on-the-fly via iDash
• AutoRate tunes in real time using vehicle diagnostics
• ActiveSafety protects engine/powertrain; Transcommand protects transmission
• Warranty friendly - no reflash required, no trace left after removal