T9454 VTA DV+ Performance Focus St Diverter Valve
Installed a GFB DV+ bypass valve upgrade. At 61,000mi my stock Go Fast Bits DVX Diverter Valve | Ford Focus ST 2013-2018 (T9654 For a couple months now I have been hearing this whistle noise when boosting. Anybody know what this is? I am hoping its not GFB Diverter Valve DV+ for Focus ST — JST Performance, LLC ...