I've been so busy lately I haven't had much time to do anything new on the Jeep, but last weekend I stole a bit of time and installed a K&N Cold Air Intake. It was easy to install and only took about an hour from start to finish.
You remove the entire OEM air intake, from the throttle body forward. It comes off with a few bolts and some clips. Then you install the K&N intake with a few hose clamps. Swap over the air intake temperature sensor and crankcase vent tube, and you're done. The fit and finish is very good and K&N provides easy-to-follow instructions.
It's not as good as the stock intake for deep water crossing, but I think you'd go with a snorkel if you plan on doing that.
I've been driving around for 10 days or so now and I'm definitely happy with it. You don't get massive performance gains, but it definitely feels a bit more responsive, especially when the air gets a bit colder at night. It's just as quiet as stock for normal driving, which I like, but when you stomp on it you get a very satisfying growl.
I didn't take any photos of the installation process, but here are a few of it fully installed.