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I replaced the factory turbo blow-off valve with an upgraded blow-off valve w/recirculation by Boomba Racing. Boomba makes a valve and installation kit for 2014+ Fiesta ST that works perfectly for TC's with a 1.6L engine. http://www.boombaracing.com/2014-fiesta-st-boost-operated-bypass-valve-full-recirculation/ The Boomba valve still routes the blow-off pressure into the intake so you will not get a loud pressure relief sound when it opens. It does create a turbo compressor surge "flutter" sound when you back off the throttle. Sounds like this (but not as loud) https://www.youtube.com/watch?v=eqx0AHdj1Wk The installation is easy but you will need an 8mm nut to attach the solenoid valve to the existing stud on the firewall. Here is the solenoid mounted to the firewall (viewed from the engine bay). The throttle response seems better. The turbo flutter sound is kinda cool but barely noticeable at highway speeds. I think it sounds like turkeys.
