I run the Stillen one, when I go to autocross events or track days I just spin the whole thing to remove it, just to make sure I get better airflow up front when I am pushing the car. Then spin it back on when I leave.
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2011 370Z Base Sport
Fast Intentions High Flow Cats, Fast Intentions Cat Back Exhaust, Stillen Gen 3 Intake,Z1 Stainless Steel Brake Lines
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