Long Tube Headers: Formed Collectors: 4-to-1 formed collectors decrease turbulence and increases exhaust velocity. The result is increased horsepower, torque and improved throttle response. Optimized Tube Lengths: Tube lengths are optimized for true pulse control technology which improves flow and performance. 3/8" Laser-Cut Flanges: These headers come with 3/8" thick laser-cut head flanges that are designed to match the head port for a leak-free seal. Extension Pipes (Street): Dual High Flow Catalytic Converters: This system utilizes 400 CPSI (cell per square inch) catalytic converters are used for maximum flow. Construction: Constructed of mandrel-bent dual 3" stainless steel piping to reduce back pressure and improve flow. Leak-Free Seal: High quality OE style flanges and band clamps are used for a complete 360 degree sealing surface. Hassle-Free Installation: The performance headers are designed to fit in the stock location with an included extension pipes which allows this system to fit without modification. This system incorporates OE style hangers and flanges for a hassle-free installation. Note: This is a "Race Only" product that is to be used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws. This system is not currently CARB exempt and is not available for sale in California or for use on any vehicle registered with the California Department of Motor Vehicle. Twisted Steel Headers; Street Series Nissan Titan 04-15 V8-5.6L Nissan Titan 04-15 V8-5.6L