Or just google it and see what's out there! I think the bed pan one might start to smell when the engine heats up! I remember a discussion on here related to engine size and air filter size. I really like the Hilborn style, but they have tiny air filters. So it's not just style, but function too! Now a old mailbox has a lot of volume!

http://www.sixbangerparts.com/site_f...oup%20shot.JPG