been using kn since 1977 on my dirt bikes great product recommended everyone get one fit and looks nice four stars four stars seems to be good quality i couldnt use it because i found four stars built engines for 20 years it does the job at a good price worked great in that time and will probably be buying another just as advertised 35 years later and im still using it warning first time user great product excellent pricing perfect fit for for my 2007 accord 4cyl worth the extra price i like it that its reusable less waste in the landfill high quality material for kn