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Old 01-06-2010, 01:25 AM   #8 (permalink)
wdb
lurker's apprentice
 
Join Date: May 2008
Location: the Perimeter
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PlainJane - '12 Toyota Tacoma Base 4WD Access Cab
90 day: 20.98 mpg (US)
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On the dyno, with the hood up and a huge fan blasting air at it, it's a performance enhancer. On the road, with the hood down and the engine heat trapped in the vicinity of the intake, it's a warm air intake. Quicker throttle response is usually noticed, but that is not the same as actual on-road power improvement.
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