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Message: <blockquote data-quote="upontheriversky" data-source="post: 1063821536" data-attributes="member: 59480">exhaust gas cools off rapidly as it goes from extractor to the tailpipe, u can lightly touch the tailpipe on hot days but definitely not the header on any day :)reason:- cooler exhaust is denser therefore heavier and slower- also exhaust velocity increases with temperature, so cooler exhaust is slower, smaller pipe as u approach the end keeps the velocity higher which is the key to NA street exhaust performance. The front part before bullet can be made bigger since exhaust is much hotter here so it is rather fast already, no need to worry too much about gas velocity. So by making front part bigger, we can take advantage of more exhaust flow volume coz exhaust can be dumped more at a short time giving what we call "pickup"i like to think of the whole exhaust system as a water nozzle, the engine being the water tap and tailpipe is the nozzle, smaller nozzle shoots out water faster while big nozzle needs more water pressure to get the same velocity as the smaller one..so we can see low end power on big nozzle is obviously compromisedthis is mostly true for street exhaust, racing purposes im not so sure :)</blockquote>

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