I drive this filter for over three years and am still thrilled. The engine runs noticeably quieter and takes better gas on. The original paper filter I came with a lot of start-up to about 140 km / h, according to Navi. The K + N it comes quickly to 160km / h. In addition, it saves expensive disposable filter change. This protects the environment and your wallet. After 60,000 kilometers of the K + N should be cleaned. A K + N Set can be found here cheap at Amazon. The fuel consumption is with me through the filter will not lower, but not necessarily higher. However, an increase in performance is clearly noticeable. I had recently noticed because I had installed the TÜV the paper filter. And the engine ran much worse. So after TÜV immediately of K + N back inside. To my knowledge, the air filter is however allowed. If my review has helped you in making your decision, you like this, please be helpful. :-)