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Old 05-02-2009, 07:22 AM   #4 (permalink)
Arminius
Future EV Owner
 
Join Date: Mar 2008
Location: Sussex Wisconsin
Posts: 674

Wannabe - '05 Honda Civic LX
90 day: 40.53 mpg (US)
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Wide open is the most efficient. Resistance is affected by the interacting factors of 1) the narrowness of the pipe and 2) the length of the pipe. More of either increases resistance.

However, a fat pipe is generally a pipe with more mass.

What I'm calling "pipe" here is anything that channels the exhaust once it leaves the engine.
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