There are five main types of dual exhaust systems. True dual is two separate pipes all the way to the back that never merge, reducing back pressure and providing better performance. H-pipes are designed to quiet the popping noise that occurs due to exhaust pulses while increasing power. X-pipes merge both pipes together and the exhaust travels through both, making it even quieter than the H-pipe. Y-pipes are when two pipes lead to one bigger pipe. It creates a vacuum effect which makes for a cleaner burn. Finally, the flex pipe sits between the catalytic converter and the manifold. We fix rust, loose connections, noise problems, and any other minor or major repairs.