RENNtech | Diverter Valve | M157 | 3rd Gen | S/CL 63 AMGRENNtech 3rd Generation Diverter Valve M157 5. 5L V8 BiTurbo. Applicable for the W221 S63 AMG and C216 CL63 AMG RENNtech's 3rd Generation Diverter Valve for the M157 5. 5L V8 BiTurbo features an all new Blow Off Valve implemented into the re designed OEM turbo tubes. The Diverter Valve releases the boost in high boost situation and or boost spikes. This especially helps during the shifting process, for faster shifting and a quicker boost response for
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