Honestly, in the end, there's not HUGE difference between a true CAI and a drop-in K&N. Yes a CAI will generate more CFM, but that won't equal 10hp difference like most claim.
Either are a great upgrade to help your car breath better, but if your not sold on the look and sound of a CAI, a drop-in is probably the more cost-effective investment. Certainly not the coolest, but the smartest.
That being said, if anyone wants a K&N for their stock box, PM me. I bought one, and bought a Dinan CAI the week after. So I have a K&N drop-in with less than 50 miles on it, I'll sell it cheap.
And in case your wondering....there was a much bigger difference in sound between the two, than performance.