RENNtech | Stainless Steel Muffler | R231 | SL 63/65 AMG mercedes-benz-a-class--177---2019-present--a-250-esr9457536 Our proprietary ECU upgrade for

Our proprietary ECU upgrade for the Mercedes M133 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

This combination unleashs the beast lurking underneath the refined exterior of your SLS

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G 550 (W463) | MY2017+ | 4x4 | M176 | 4

Constructed of high-strength lightweight aluminum

RENNtech | Stainless Steel Muffler | R231 | SL 63/65 AMG mercedes-benz-a-class--177---2019-present--a-250-esr9457536 Our proprietary ECU upgrade forRENNtech Stainless Steeel Sport Muffler for 231 SL 63 65 AMG. Gains: Up to 10HP & 15TQ 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