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Message: <blockquote data-quote="AaRoN" data-source="post: 852047" data-attributes="member: 8691">Lol...I'm almost offended. First, let me tell you that this information is not something I read on the interwebz or in a car-porn magazine. I am a Ford Certified Technician and I graduated from the Universal Technical Institute with honors. If you feel you need some kind of proof of that too, I'd be happy to snap a pic of my certs.How exactly is velocity measured in an exhaust system? Velocity isn't really "measured" in an exhaust system. It's merely a law of physics. Think of a large diameter straw versus a small diameter straw. When you drink from a large diameter straw, you get more of what you're drinking but it doesn't go very far inside of your mouth. A smaller diameter straw moves the liquid quicker and farther into your mouth.What happens to exhaust gases as they cool down? As exhaust gases cool, they slow down. Think about what happens when the you are running and exhale slower. Takes you longer to catch your breath. Right?Where in the exhaust system do the gases cool down and is it farther down the system as you increase rpm? Gases begin to cool almost immediately. Not by a significant amount and yes, it is always further down the exhaust system that they cool the most. A larger exhaust system (more surface area) will cool the gases more quickly.Where is the pulse based exhaust scavenging concentrated at? The scavenging depends on the entire exhaust system (pipe diameter and length, header design, muffler design, back pressure, etc.).An exhaust system has to be matched to an engine. Do you think that manufacturers just pull pipe sizes, lengths, bends and muffler designs out of a hat and say " that looks good"? It's all engineered based on formulas. Formulas which I'd be happy to share with the SN95 community and if you still feel this is all "stuff I read on the internet".</blockquote>