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Message: [QUOTE="vanderchevy18, post: 59489, member: 569"] Of course though there is a point when the hot fast flowing gasses become counter productive because of egt and backpressure issues. That's what we're trying to find here. I will let y'all know what my findings are when I get the 5" pipe to 6" stack put on. I know I've always been told and believed that 4"exhaust was plenty, but after seeing that I'm of the opinion its not. I'll let you know exactly what differences there are if any at all. I'll have the stack on in 2 weeks. Nothing else will change. I'll measure drive pressures, egts, and watch for smoke or haze qualities to change. Anything else? [/QUOTE]

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