I am running one, you can hear it but it is not all that bad. One thing I will say is make sure your fuel pressure is right, the fitech can't handle too much fuel pressure it makes the drivers shut down in the throttle body. makes them hard to start and sets weird codes. I made an access port so I could check it. Also the pressure regulator is kind of small for this application, it has a screen on it that clogs quite easily raising fuel pressure. The regulator comes from a Fuel Pressure Regulator: 1998-2003 VW Beetle 1.8 engine.