RENNtech Stainless Steel Muffler for 231 - SL 550 mercedes-benz-s-class--222---2018-2020--s450-biturbo-esr1451600 Gains: +7HP & +28LB-FT

Gains: +7HP & +28LB-FT

CLASS E CABRIOLET (A 207) 500 Blue Efficiency [2 Filters Required] (HP: 408 | Year: 11 > )

Gains: +10HP & +14LB-FT

Rated by RENNtech:                402 HP @ 5

If your vehicle is equipped with factory exhaust valves

RENNtech Stainless Steel Muffler for 231 - SL 550 mercedes-benz-s-class--222---2018-2020--s450-biturbo-esr1451600 Gains: +7HP & +28LB-FTRENNtech Stainless Steel Sport Muffler for 231 SL 550. Gaines: +15HP & 20TQ RENNtech stainless steel (SS) sport mufflers are hand made and 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 offer incredible sound in a lighter than the stock weight exhaust with improved performance. This is accomplished by reducing exhaust system back