aFe Twisted Steel 304 Stainless Steel Header w/ Cat 13-19 Subaru Outback H4-2.4L

This system is constructed of 1-5/8 IN - 2-1/2 IN mandrel-bent 304 stainless steel tubing for maximum strength and durability. Includes a catalytic converter which is less restrictive than the factory converter providing maximum flow. Utilizing factory style flanges this system is designed to fit in the stock locations with no cutting or modifications required for a hassle-free installation. Tube lengths are optimized for true pulse control technology which improves flow and performance. Formed collectors decrease turbulence and increase exhaust velocity. The result is increased horsepower, torque and improved throttle response. State-of-the-art computer-aided design technology is utilized for precise vehicle fitment. 100% TIG-Welded for race-proven strength and durability.