Performance Gains: This system produced gains of up to +26 HP and +39 lbs. x Ft. TQ., as measured on our in-house dyno. 1-3/4" - 3" 409 Stainless Steel Construction: This system is constructed of 1-3/4" - 3" mandrel-bent 409 stainless steel tubing for maximum strength and durability. Dual High Flow Catalytic Converters: Includes dual high flow catalytic converters which are less restrictive than the factory converters providing maximum flow. Heavy Duty Flanges: Factory style laser cut flanges are used used for a secure leak-free seal. MIG-Welded: 100% MIG-welded for race proven strength and durability. aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility. Twisted Steel Street Series Long Tube Header & Connection Pipes Nissan Titan 16-19 V8-5.6L Nissan Titan 16-19 V8-5.6L