Well counterclockwise WILL decrease the tension, but to make the car run leaner (if you're not doing any other mods) you'll wanna turn the dial clockwise.
Because with less tension, the same amount of airflow will open the flap more, calling in for more fuel, the only way to lean the mixture out without drilling holes (on the AFM) is to turn the thing clockwise, but I would advise against this. Without holes, only about 1 click is acceptable, as anything more puts the air/fuel out of whack.
Ahmet
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