What air filters are you guys running? I've been running the stock filter for more than a year and I recently got a "twin air" filter from the local shop as so I wouldn't have to wait a day when I clean the filter I can just pop the fresh one in. The twin air comes in two pieces and is a pain in the a$$ to install. The top layer will just fall out while you're trying to put the side cover on. Plus, I'm doing this all with my hands covered in filter oil making a mess everywhere I touch. I can say I don't recommend the twin air. Are the after market filters better than stock? Do I need to re-jet if I run them? I'm leaning towards just getting another stock one. I've never had a problem with it.