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The wastegate opening and closing is usually supposed to be audible, especially for an open dump. Yours does seem very slow though, maybe duty cycle frequency is too low in the tune if other hardware is installed correctly. Default is 10hz for EcuTek. That sounds like 1hz lol. I personally prefer like the sound of 15hz which is what the wrx/sti's tend to be.
Just a double check, ebcs port 1 goes to intake pre-maf or atmosphere, port 2 goes to wastegate bottom port, port 3 to boost source. That's my hookup at least. There's more than one way to do it but I see that the most.
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