RENNtech M157 Biturbo ECU+ Upgrades are TÜV approved!
Our proprietary ECU+ upgrade for the Mercedes M157 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; increasing performance from 563 HP and 594 lb/ft torque, to an astonishing 669 HP and 734 lb/ft at the crank!
Performance Numbers Overview
SL 63 AMG (R231 | FL MY2015+ | RWD | M157 | 5.5L V8 BiTurbo) Stock Performance (at crank):
Rated by Mercedes-Benz: 577 HP @ 5,500rpm; 664 LB-FT @ 2,000-4,500rpm
Rated by RENNtech: 605 HP @ 5,500rpm; 669 LB-FT @2,800-3,900rpm
Note: Mercedes M157 engine performance when measured, obtains higher power numbers than rated from factory.
SL 63 AMG (R231 | FL MY2015+ | RWD | M157 | 5.5L V8 BiTurbo) Modified Performance (at crank):
Rated by RENNtech: 669 HP @ 5,500rpm; 734 LB-FT @ 3,700rpm
575 awhp @ 5,500rpm; 631 awtq @ 3,700rpm
Crank Performance Numbers are calculated with a 14% Drivetrain loss on RWD vehicles.
**VIN NOTE** RENNtech often requires your vehicle's VIN number to process orders. Please leave this information in a note during checkout or email us with your order number after order is placed*
RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning. His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1999, by the request of AMG Germany, Feyhl branched out on his own to start RENNtech and service the existing AMG North America customers.
Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars.
Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the more recent 945 LB-FT 5.5L V8 Biturbo RENNtech R3+ Monster. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles.
We design, engineer and manufacture our proprietary line of tuning products in-house at our facility which features a full fabrication and machine shop with CNC and rapid prototyping capabilities; in-house performance dynos, complete engine management and software tuning capabilities along with a complete service/repair/installation facility and a full-time design, engineering and sales staff.
Our headquarter facility is located just north of the Palm Beaches in Stuart, Florida
