Quote:
Originally Posted by Vettezuki
[EDIT]
There seems to be three ways to think about this.
1 - Headers are where all the magic is. They must be part of the engine system and design for desired results. After the collector, the less restrictive the exhaust the better.
2 - The entire exhaust system from headers/manifolds all the way to exhuast tips must be considered for maximum performance/desired results. Simply increasing exhaust size is not necessarily going to give you any benefit and may even cost you some performance.
3 - All things being equal, the less restrictive the exhaust with larger headers and exhaust pipes, etc., is an inherently good thing and should basically be maximized. Of course there are diminishing returns, but you would basically never loose power by going to a larger and less restrictive exhaust system, from the headers all the way back.
At first I tended to think along the lines of 2. But now that I think about it more, 1 seems more likely. Links to papers and dyno results, anecdotal stories etc. welcome.
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This Article is aimed at Honda/Acura but seems to have some good basic theory-
http://www.team-integra.net/sections...sp?ArticleID=2
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