To be honest, I haven't driven much with this intake yet. I can't comment (yet) on whether my check engine lights come on, but if I do I'll update my review. I installed this in about an hour; I haven't refilled yet either and for most of my run this tank is CAI free. The directions were pretty close, if not exact. I'm pretty sure it can be installed without instructions at all; if you have no UNDERSTANDING. I installed this on my 2006 F150 5.4L. The only thing I don't like about this filter is the way it fits onto the throttle body. I'll come back and check it out after a few off-road hits. The rubber gasket doesn't cover as much of the back of the throttle body as it does the front, which worries me. Maybe this is due to model variations? I'm pretty tight, but I guess time will tell. You can definitely notice the sound difference; My truck sounds really good. In response to another review, my filter block fits really well (maybe a difference between 06 and 07) and I used the standard truck holes pre-drilled in the mounting box. While I'm happy with that, I think I'll have to go back to that throttle linkage at some point. I might come back to this review in a month or two, but in the meantime feel free to ask me any questions.
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