R1 Performance Package for S 550 (W221- 413 HP / 422 LB-FT) bmw-7-series--e38---1994-2001--esr3788598 We have found the M176

We have found the M176 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

Larger impeller (inlet) and turbine (exhaust) cartridge

RENNtech Stainless Steel Sport Mufflers w/Eclectronic Valves for the W205 - C 63 AMG BiTurbo

RENNtech W222 S550 Sport Package

With the R2 Performance upgrade

R1 Performance Package for S 550 (W221- 413 HP / 422 LB-FT) bmw-7-series--e38---1994-2001--esr3788598 We have found the M176R1 Performance Package for 221 S 550. Includes ECU Upgrade and Stainless Steel Header. Up to 413HP and 422 LB FT. Gains: +31HP & +31 LB 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