Theres no doubt that Open looks good.I dont run one because I dont think its safe. I have a Phase III belt drive on my shovelhead and dont run it Open.Yeah yeah I know custom builders run open and thats thire business not mine. I do leave the derby cover off so heat buildup can escape. Observant Know it all": "Hey you lost your derby cover, better go back and look for it". Me: "Its back in '77 and if I had a time machine Id go back and stay there."