i had the K&N cold air kit for my 2008, it definitely better than the stock one as far as air flow paths into the motor. I recall seeing a dyno sheet with that kit installed ... it was like 5hp increase ... lol nothing earth shattering.
18 Redline Pearl w/Two–Tone Paint Compass Latitude 2.4L, 4x4, Auto Mods/Addons:
Eonon GA2168K Android 10.1" Screen Double Din Car Multimedia Center
11 Mineral Gray Metallic Compass Sport 2.4L, 4x4, Auto
08 Red Compass Sport 2.4L, 4x4, Manual