R1 Performance Package | R230 | SL 550 | 413 HP / 422 LB-FT | 5.5L NA V8 | M273 mercedes-benz-clk-class--209---2004-2010--clk-63-amg-esr9002317 +50 HP / +95 LB-FT

+50 HP / +95 LB-FT

These side skirts are designed to fit the C190 - AMG GT R and GT R Pro

SL (R129) 320 (V6) [2 Filters Required] (HP: 224 | Year: 98 > 01)

294 LB-FT @ 3

Turbo Upgrade with lightweight forged billet turbo wheel features a dramatically larger-than stock impeller (inlet side) and an increase in the turbine trim (exhaust side)

R1 Performance Package | R230 | SL 550 | 413 HP / 422 LB-FT | 5.5L NA V8 | M273 mercedes-benz-clk-class--209---2004-2010--clk-63-amg-esr9002317 +50 HP / +95 LB-FTR1 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