Almost nothing mods out a semi quite like big shiny chrome semi truck stacks! The bigger the better! Expand your factory stack with this 6" absolute show-stopper! These stacks are show quality, with bright nickel chrome plating and hand polished for a flawless and durable finish. They are 100% American made of cold rolled, Aluminum killed Carbon steel. Guaranteed for (1) full year against product defects, workmanship and materials. The turn-out top directs exhaust away from trailer and also reduces rain water build-up. Turn-out top, 6" diameter stack through reduced to a 5" plain bottom x 84" long. Clamps required (not included).