These aFe Atlas XP Y-pipes feature a true 2 Into 1 mitered merge collector that eliminates dead space that can cause turbulence and hinder the flow that formed collectors are prone to produce. They are manufactured from aluminized steel, feature mandrel-bent piping, and high-quality OEM-style flanges with band clamps are used for a bolt-on, leak-free installation. The Y-pipes are available with high-flow 300 cell catalytic converters for better flow without CEL lights, or without catalytic converters for true race performance.