Cold air intake & K&N filter


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Thread: Cold air intake & K&N filter

  1. #1
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    Cold air intake & K&N filter

    Do you think a cold air intake valve and adding a K&N filter would help the fuel efficiency be better? Also would it be next to impossible to install the intake because of the low boxer engine. My MX5 ang Rogue loved me for it. For me it was an easier install due to my small lady fingers. Didn't even break a nail.( tmi?)
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  2. #2
    Member BlackFish's Avatar
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    Quote Originally Posted by Arene View Post
    Do you think a cold air intake valve and adding a K&N filter would help the fuel efficiency be better? Also would it be next to impossible to install the intake because of the low boxer engine. My MX5 ang Rogue loved me for it. For me it was an easier install due to my small lady fingers. Didn't even break a nail.( tmi?)
    Don't worry, theirs PLENTY of room in the engine compartment. In fact, an intake should be the easiest thing you could install yourself. I've had cars that require dismantling all sorts of things just to get to the intake, but the intake in this car is perfectly centered in the middle of the engine compartment with TONS of room and nothing in the way. Honestly, I couldn't believe Subaru said that they "wouldn't be able to fit a turbocharger" in later models of the car...I CALL BULLSHIT! I pay for my own gas but I would still rather have performance than more miles per gallon, so I really don't know about the fuel efficiency changes. wait until some people (exhibit A: me) start dropping them in to see what they (I) say.
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    It appears even installing a drop in filter affects fuel tuning in the ECU. Rally Sport Direct has a thread where they dynoed the stock filter, no filter, and an Apex'i drop-in filter. Gains for the Apex'i were around 3 whp with slight gains in torque pretty much across the board. I was looking at their dyno chart and it appears the run with the Apex'i filter ran quite a bit leaner AFR's than stock. It appears the stock fuel tuning is really rich towards redline (in the 10:1 range they said). People need to be really careful when changing intakes, as without ECU tuning you could run dangerously lean. Perrin designed one that mimics the stock fuel curve, and another that will require ECU tuning. The way air flows over the MAF can cause large changes to fuel tuning as we've seen.
    Last edited by donwrblue13; 06-20-2012 at 07:23 PM.
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  4. #4
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    I just installed Apex filter ,intake sounds much louder,anyone
    notice this ?

  5. #5
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    Yeah, drop in filter does change sound for better IMHO.

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    Quote Originally Posted by sportsguy83 View Post
    Yeah, drop in filter does change sound for better IMHO.
    Really? I never would have thought a drop in filter would make much difference in sound? Cool!
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    I mean, everything in its context you know... It will not sound like a CAI. But since we have the resonator tube, the change in sound is noticeable. I used the KN but returned it in the expectation of a short ram purchase.

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    Would it benefit from a CAI rather than a high flow box filter type?


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  9. #9
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    I didn't realize that the bottom of the filter box was was not fully closed.
    Closed it much quiter.

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