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I leave a brief explanation and test in the flowmeter of a polished duct and a rough duct, their differences both in the way it turns and in its direction towards the spark plug, I hope it helps you and you can apply some of what is explained, if you like to know more about all this, I teach engine preparation and camshaft tuning courses .. WhatsApp: +54 9 3329615167 Instagram: Luchobraico Baradero province of Buenos Aires Argentina 🇦🇷