RENNtech | Stainless Steel Sport Mufflers w/Valves | S550 | W222 | 4.7L BiTurbo V8 | M278RENNtech 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
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