BCR now offers velocity stacks for Honda CB fours, twins, Yamaha XS650s and New Triumph carbureted Bonnevilles. The stacks have a nice retro design and has a snow cone screen set up to give that vintage, aggressive look. The stacks are made of aluminum with stainless steel screens. The stacks will slide right into your carburetor intake opening and are secured by 3 allen set screws instead of hose clamps.