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RE: Re: RE: Stock dual exhaust size?
Maybe this'll help... maybe not.
"Pipe" is measured by it's I.D. i.e. 1/2" water pipe is 1/2" inside. Pipe's "schedule #" is what determines wall thickness and pressure rating; schedule 40, sch. 80, sch. 300. I sometimes do steamfitter's work at the RR...