Not a lot has been happening lately. Proudly I can say the S4 has been pretty problem free for some time now. That said, it kind-of feels odd when something isn't wrong.... so, you go looking for something to fix. In that past that can get me trouble so I figure I keep it simple. I put in my K&N Air Filter back when I first got my car, 80k miles or more ago, and I'm sure it likely due for a cleaning. If you have a K&N filter you know it comes in a cherry wood red like color, but mine was more of a charcoal gray.... clearly it needed to be cleaned. Ordered the cleaner and oil kit from Amazon and two days later went to work.....