Just installed air intake on 1.5L!

[E3pO]

Installed it yesterday and have driven about 40 miles with it.. I can slightly tell an increase in power, but i could be totally lieing to myself ;).

Anyway, I had a few questions... A buddy of mine said that it could possibly REDUCE my gas mileage due to something called VE? I'm guessing it means Volumetric Efficiency.

Here is our conversation:
let me explain
your engine is n/a
(naturally aspirated)
meaning..if you think about..the maximum amount of air it can suck in during an intake stroke is enough air to fill the cylinder to atmospheric pressure
now with older intakes, you obviously have restrictions such as filters and small throttles and airboxes which gives you less than atmospheric pressure in the cylinder (less than 100% ve)
however, with the newer engines (ie, the high milage toyota engines)
the intakes are "tuned" (are a certain length) so that the resonance of the air in the plenum forces more than atmospheric into the cylinder
this is also helped with that cars specific cam
meaning the car isn't wasting energy on "sucking" air in
however, an aftermarket performance intake could mess up the resonance
which would actually reduce ve and ultimately your gas milage
plus its going to mess with your maf, even it says it wont
which can be tuned out.

TL;DR
Basically he said that my engine might have to try harder to suck in air with the new intake then the old tuned intake that came with the car which results in lower gas mileage.

Here is the turbo I purchased, and a picture of it inside my car! :) (Attached)
http://www.amazon.com/gp/product/B00...00_i00_details