I've been doing some routine maintenance on my gen3 (oil change, balance & rotation, flat repair.....

) and figure it's about time to change the air filter on my short ram intake. I got it last summer and I'm still using the Ractive filter that came with it. Do most of you guys change the air filter every 12 months/12k? I'll probably replace it with a K&N of the same size, is this a good idea? And would a heat shield filter do any good (doubtful)? I've searched and couldn't find exactly what I was looking for. Thanks!