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Originally Posted by sperry
The ECU's uses both MAF and MAP, however, the CAI's just flow too much throught the MAF w/o the MAF voltage changing properly. Up here at Reno altitude, it's not a big issue, since we've got less O2... but in SoCal, where that car's from, it's probably pretty bad.
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Is it a problem with the stock MAF transfer function, like it just doesn't go up high enough for the ECU to interpolate accurately once you've changed the intake tubing? Or does the Subaru MAF hardware just give an inaccurate signal past the factory specified range? Either way, that's just strange to me. You can pretty much change the entire exhaust, intake piping, manifolds, etc. on a Mustang and the computer will compensate for it with the stock meter, as long as the injectors aren't maxed out. Just replacing the intake piping in front of the meter is a very small change to whack out the computer that bad...