05-08-2010, 12:56 PM
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#15 (permalink)
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Basjoos Wannabe
Join Date: Apr 2009
Location: Arkansas
Posts: 870
Thanks: 174
Thanked 49 Times in 32 Posts
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Quote:
Originally Posted by zhillz
You know what back pressure is? Its resistance coming out of the pipe because of smaller diameter/ resenators/ cats/ muffler. Little pipe = back pressure, large pipe = free flowing. NA engines NEED back pressure. If you removed your exhaust system after your cat, you would loose performance and MPG in your na motor. On a turbo motor, an open down pipe is the way to go.
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Here's an article I found on the subject.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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