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Hey guys so after seeing that a CAI is going to cost me over 200 bucks I'm thinking to my self why not make my own? I'd like to get a different filter then the square one that comes stock. not just make the tubing smooth. since i'd like it to be loud. the only thing that I'm thinking will the sensor thats on the intake will my check engine like come on? has anyone done this? Any ideas? thanks!
 

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I've wondered about this too. I've done the dual inlet mod as described in jmr's original post and replaced the OEM filter with a K&N on my '12. The gen 4 filter area is fairly large. You'll need a fairly large cone/cylinder filter to increase flow capacity over the stock size. To maintain cold air, you'll need to stuff the filter into a closed chamber with fresh-air-only inlet(s). I wonder if the OEM box could be used. Without having to worry about the upper and lower portions of the OEM airbox as to being clean and dirty, perhaps a fairly large cylinder filter would fit. Then you could fab an inlet pipe from the airbox to the throttle body and seal it at the airbox. The sensor in the OEM inlet pipe could just be transferred to the modded inlet pipe. Then if you add the second air inlet to the OEM box as many have already done, it seems like you'd have more air in, more air filter flow, and an improved throttle body inlet tube. Just thinking out loud here.
 
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