I have a 2007 and the air filter is built into the engine cover. It is a pain in the ass to change...unless someone knows something I don't. To remove the enging cover, you have to grip it on either side in the rear and pull up hard and steady. Then the same about in the middle. I thought I would break it before it popped free and, in fact, one of the retainers has been damaged. Once off you must disassemble it into two pieces, change the filter and reassemble. Thankfully you don't need to do it very often. I'm sure someone with more knowledge can give you a better discription on how to do it.
Steve