My Raptor SD (used) had the factory Air Cleaner assembly installed. It was clean when I bought it. We are currently experiencing a drought in Delaware. Lots of dry grass and dust on the lawn. I checked the filter after about 5-6 hours of operation and was unpleasantly surprised at the quantity of "stuff" surrounding the filter. Not happy. I blew out the pre-filter and inspected the inner filter and it was OK. So, a bit later I stumbled on to a You Tube video about the Power Equipment Man filter kit and decided to give it a try. Of course, it was currently out-of-stock. So I looked on Amazon and EBay but decided that I would rather wait than take a chance on the import versions. So, after a couple of days, I decided to attempt to order the Power Equipment Man version & hope it would arrive soon. Even though the web site listed it as still out-of-stock, the transaction went through instantly and I received an order confirmation within a few seconds. The next day, I received a shipping notice and was very pleasantly surprised that it was being shipped via UPS with FREE SHIPPING. It just get better. I ordered it on 6 June and it was delivered on 11 June. The included instructions contained pictures of every step, and installation was absolutely painless. An additional bonus with this kit is that my mower now resembles a Big Rig (you know Kenworth or Peterbilt). Overall, I am completely satisfied with this upgrade, and cannot express a single negative comment. From ordering, to shipping, to installation, everything proceeded smoothly. A huge THANK YOU to the Power Equipment Man---VERY HIGHLY RECOMMENDED.