RENNtech ECU Upgrade | C217 | S 550 Coupé | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 mercedes-benz-sl-class--232---2022-present--sl-43-amg-biturbo-esr7590087 0" Weight: Construction: 1-piece Forged

0" Weight:   Construction: 1-piece Forged Tire Size: 275/30-19

Stainless Steel Downpipes: Made out of from 304 High-Strength Stainless Steel and are equipped with 200 Cell Sport Catalytic Converters downpipes improve performance

Our transmission upgrade consists of a mechanical upgrade to the transmission clutch packs

Rated by RENNtech (peak @wheel):              584 whp @ 5

CLASS S (W 220) 55 AMG V8 [2 Filters Required] (HP: 360 | Year: 99 > 02)

RENNtech ECU Upgrade | C217 | S 550 Coupé | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 mercedes-benz-sl-class--232---2022-present--sl-43-amg-biturbo-esr7590087 0" Weight: Construction: 1-piece ForgedECU Upgrade 500HP 625LB FT Gains: +26HP +59LB FT 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 components or for areas and countries with extreme altitudes, temperatures or