Mercedes SL63 AMG Biturbo (2012on) - RENNtech ECU intermediate upgrade





RENNtech M157 Biturbo ECU Upgrades are TÜV approved!

RENNtech’s intermediate level ECU upgrade for the Mercedes M157 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or fuel quality concerns.

Their intermediate ECU tune increases performance from 536 HP and 550 lb/ft torque to 638 HP and 695 lb/ft at the crank! This is a slight reduction from our standard tune but still offers white knuckle performance at one of the most affordable price points in the tuning market.

  • Note: We have found the new M157 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see slightly higher baseline numbers than claimed by the factory.


SL 63 (R231) Stock Performance (Without Performance Package):

  • 530 HP @ 5250 RPM; 590 LB-FT @ 6000 RPM


Modified Performance (Without Performance Package):

  • 638 HP @ 5500 RPM; 695 LB-FT @ 3800 RPM


SL 63 (R231) Stock Performance (With Performance Package):

  • 557 HP @ 5500 RPM; 664 LB-FT @ 6000 RPM


Modified Performance (With Performance Package):

  • 638 HP @ 5500 RPM; 695 LB-FT @ 3800 RPM


Max. Gains:

  • +108 HP / +105 LB-FT


*NOTE – We would need either the ECU or the vehicle bringing to our premises in Cheshire

Due to some of the products coming direct from RENNtech USA please allow 7-10 days for delivery

Prices may vary in accordance to the current exchange rate, please contact us for the current confirmed price