Coffin Mufflers specializes in manufacturing unique mufflers designed for increased horsepower, throttle response, and fuel economy. They offer custom installations and car builds at their fully-functioning shop, along with buying and selling cars and motorcycles, particularly old Harleys, Indians, cars, and trucks. The Coffin Muffler is proudly made in the USA using high-quality American-made materials and features a patented, trademarked, and copyrighted design. Additionally, they provide services such as catalytic converter installs, exhaust leak repairs, and complete exhaust systems installations.