Quote:
Originally Posted by Lightngsvt
So the valve normally only opens during startup?
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One value is open and one valve is closed during startup. Depending on your climate, this is very easy to see when the temps are cooler. You'll see water vapor only coming from one pipe.
The OP now has both valves opened, which results in both valves being opened along with a louder startup exhaust sound.
A lot of people have referred to this as a golf tee mod.