I am getting new tires and -1 front sproket put on and getting ready for this weekend. Right now the only thing that I have on my bike is a Yosh TRS bolt-on. If I get the air filter replaced with say a K&N or BMC will I need a PCIII? Also which one is better, the BMC or the K&N also I have never seen anything that has said if the BMC was reusable. What do yall think, or should I wait and sell my muffler and get a full system then a PCIII and filter?