Thats wierd I am always making fine tune adjustments to my homebrewed factory cold ram air box. I believe like I said before it works better than a AEM cold air intake. Mine does have a flat panel K &N. Ofcourse the front of factory box is completely cut out and also a angle cut on right side of box. Like I mentioned before I have a adjustable aluminum plate to adjust the side opening and the amount of air intake. I also have a hole on the bottom of air filter box with a funnel like tube just above the shock mount. Keeps water and dirt out with no problems. Air is also sucked or ramed in from front removed headlight bezel. Thats cold air feed. Anyway with many adjustments I can make, one thing I have learned is that the 2.5L is very sensitive to the way it inhales air. Well at least mine is. One slight adjustment of only 1/8 inch movement in the sliding plate I can gain HP and loss MPG. Adjust it another way I gain MPG and lose power and torque. I have probably made one hundred adjustments. No kidding. Along with other mods under the hood I believe I found that sweet spot between power and MPG. She is smooth and really fast on take off. Or I can take off really slow and controlled. There was a time I had it where she took off so fast it was hard to control. Yet lost torque and top end speeds, along with really bad gas mileage. Anyway my point on my 2.5L it sucks air in with just the right amount and force. I guess the lil power plant does not have enough power to such though a giant filter. So bigger is not always better in my case. Its like trying to suck through a giant straw. You would need a big set of lungs. But just the right size straw you can get just the right amount of juice. Ofcourse the power I do have is in conjuction with my other mods. Homebrewed adjustable cold air feed intake, bigger air tube with heat wrap, Bigger TB with tapered design for good air charge, custom high velocity TBS, Bored out intake manifold, accel 42,000 volt coil, accel wires, NGKs gapped at .041. Tried bigger and this setting works best for my mods. Also run magnaflow free flow exhaust. Cut and trimmed factory fan for less wieght and drag. That was spooky. It actually is cooling better along with spooling up real quick. My little rig is a daily driver and sees mild explorations. Running on its BB and 31 BFG muds. Any bigger and there goes all my umph. Happy Wheeling.