RENNtech M276 Biturbo ECU Upgrades are TÜV approved!

Our proprietary ECU upgrade for the Mercedes M276 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability.

Our ECU tune offers the biggest performance gains on the market with our dyno results increasing performance from 362 HP and 384 lb/ft torque, up to an astonishing 402 HP and 454 lb/ft at the crank!

GL 450 BiTurbo (X166 - M276 Biturbo 4-MATIC Engine) Stock Performance:

• 362 hp @ 5,500-6,000 RPM; 384 lb-ft @ 1,800-4,000 RPM

• Note: Mercedes M276 engine performance when measured obtains higher numbers that rated from factory.

GL 450 BiTurbo (X166 - M276 Biturbo 4-MATIC Engine) Modified Performance:

• 402 hp @ 5,300 RPM; 454 lb-ft @ 3,200 RPM