RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 aston-martin-dbx707-esr8045635 and dependable stopping power under

and dependable stopping power under demanding conditions

549 HP @ 6800 RPM

RENNtech ECU Upgrade for R171 - SLK 350

0L V8 BiTurbo) Modified Performance (at crank):

Our down pipes mate perfectly with the stock Mercedes-Benz AMG exhaust system and include all necessary mounting hardware and clamps

RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 aston-martin-dbx707-esr8045635 and dependable stopping power underECU Upgrade 500HP 625LB FT Gains: +26HP +59LB FT RENNtech tuning products are certified to meet CARB standards in all 50 States. Our intermediate level ECU upgrade for the Mercedes M278 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