The Hooker Headers Maximum Flow Mufflers feature a straight through design that greatly increases flow while still producing more horsepower then a stock muffler or an open pipe in place of a muffler. Hooker Headers packs these Maximum Flow Mufflers with a high temp material that absorbs excessive sound, but yet still able to deliver that deep rumble! The case is made from a aluminized steel along with a stainless steel core for long life and durability!