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57rookie · 10-29-2017, 01:15 PM

the circumference is 7.5" around using a piece of tape. I am having a brain fart here - there was a formula posted using pie 3.14 to tell me the diameter - anyone have this formula???

10-29-2017, 01:15 PM	#3
57rookie Registered User Join Date: Jul 2011 Location: Calgary, Alberta Posts: 153	Re: Exhaust diameter for a 71 stock GMC the circumference is 7.5" around using a piece of tape. I am having a brain fart here - there was a formula posted using pie 3.14 to tell me the diameter - anyone have this formula???