Thanks to its fast-flowing, mandrel bent 2.5in. Main piping and 3 Straight-Through mufflers ending in a Quad Split Rear exit with 4in. Polished Welded-Double Wall-Angle Cut-Rolled Edge-Resonated tips, this Pontiac Grand Prix exhaust kit has the performance chops to match its sporty sound and appearance.Upgrade your ride to the next level with an exhaust that has the pipes to put other Pontiac Grand Prix's to shame. With this system your vehicle will be producing Moderate exterior and Mild interior sound levels while leaving other cars and trucks feeling envious at every stoplight. Exhaust kit 16726 features a cat-back layout that replaces your ride's stock exhaust components from near the catalytic converter on back. Extensive 3D scanning during development has resulted in a direct-fit design that you can easily install yourself.