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...your injectors are still injecting the same amount of fuel so your not going to use more fuel with colder intake air....
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The maf is not only a maf, it is a tmaf sensor actually. Timing and fuel delivery are adjusted by temperature so the injector pulsewidth will differ with different temperatures.
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Now there are better intakes you can add but it will have to incorporate two things: A way to add cold air (I.E. scoop, fender inlets) and some type of a RAM air system.
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He still has the stock head. The head is the restriction..
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....keep in mind the engine in a 4 banger that doesn't have a ton of power....
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Come for a ride with me some time..
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P.S. adding a catback exhaust or complete exhaust will help also...
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I've covered this many many times, the head doesn't breathe well enough to gain from this.
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