Quote:
Originally Posted by Compaq888
A couple mpg. I got 31.4mpg driving 200 miles at night on the freeway with a warm air intake. When I put the stock intake and filter on I would get 38-39mpg. Huge difference if you ask me. This is why i'm keeping everything stock on this car.
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Definitely sounds like your WAI modification plumbed into the system after the MAF instead of before the MAF.
IF no air flows through the MAF the ECU is forced to operate in open loop. Hence your 17% decrease in fuel economy.