Thread: Cold Air Intake, Headers, and Exhaust
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Old 09-25-2009, 11:50 PM   #13 (permalink)
IsaacCarlson
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
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wood hauler - '91 Ford F-250
Team Pontiac
90 day: 26.69 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
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I have heard a lot about engines needing back pressure
WHY??? I guess i just don't quite understand it.
I know why on a 2 stroke but on a 4?
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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