RENNtech | Stainless Steel Sport Mufflers w/Valves | S550 | W222 | 4.7L BiTurbo V8 | M278 mercedes-benz-gl-class--166---2013-2016--gl-450-biturbo-esr5090166 Mercedes M178 engine performance when

Mercedes M178 engine performance when measured

improving engine cooling and modifying boost mapping for turbo charged vehicles

which will be credited upon return of OEM turbo pipes to RENNtech

CLASS S (W 221) 500 Blue Efficiency 4-matic [2 Filters Required] (HP: 435 | Year: 11 > )

Rear: Style: Performance Series 10

RENNtech | Stainless Steel Sport Mufflers w/Valves | S550 | W222 | 4.7L BiTurbo V8 | M278 mercedes-benz-gl-class--166---2013-2016--gl-450-biturbo-esr5090166 Mercedes M178 engine performance whenRENNtech Stainless Steel Sport Mufflers w Valves for the W222 S550 BiTurbo. Gains: up to 10 HP & 15 TQ. RENNtech Sport Mufflers are made out of T 304 stainless steel (SS) and 100% hand crafted in the USA. This exhaust system is rigorously tested to remove any unwanted resonances in the cabin to deliver a deep sound that keeps with the character of a luxury performance vehicle. Our mufflers with 2 3 4 inch diameter tubing offer lighter weight than the