Actually Circumference=Diameter x Pi. If the circumference is 3" and Pi is 3.1417, the diameter would be 0.955 inches. 
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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