R1 Performance Package | R230 | SL 550 | 413 HP / 422 LB-FT | 5.5L NA V8 | M273R1 Performance Package for 221 S 550. Includes ECU Upgrade and Stainless Steel Header. Up to 413HP and 422 LB FT. Gains: +31HP & +31LB FT The R1 performance package for the Mercedes 550 includes our proprietary ECU upgrade in addition to our stainless steel shorty headers designed specifically for the 550 V8 for a combination that provides increased performance, sound and throttle response across the vehicles entire powerband. R1 performance package
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R1 Performance Package | R230 | SL 550 | 413 HP / 422 LB-FT | 5.5L NA V8 | M273