Tri-Y Header2005-16 Toyota Tacoma / 4Runner / Prado / Hilux2.7LHeader Style: 4:2:1 Tri-Y Header Material: SteelFinish: Silver Ceramic CoatedPrimary Tube Diameter: 1-1/2"Primary Tube Gauge: 14 GaugeCollector Attachment: 2-Bolt FlangeCollector Diameter: 2-1/4"Tuned: NoFlange Thickness: 3/8"Bolts and/or Studs Included: YesGaskets Included: Re-use factory gasketsY-Pipe (Crossover) Included: NoQuantity: Sold as a Complete KitCARB E.O. #: D-540-6Warranty: Limited Lifetime to original purchaserNotes: This tri-y header kit is an easy installation and will really wake up the motor on your Toyota. Tri-Y, or 4 into 2 into 1, style headers by design will increase the power of your motor across the widest RPM band possible, that is the beauty of the design, that is why they are the best street header available.