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Doug Thorley Header THY-367Y4-DA-C

Doug Thorley Header
Doug Thorley
  • Our Price: $769.00
  • Shipping:FREE SHIPPING
  • Part Number: THY-367Y4-DA-C
This item is temporarily out of stock.

Tri-Y Header

  • Part #: THY-367Y4-DA-C
  • Ceramic Coating
  • Driver Side Exit
  • 2.5 In. Collector
  • 1-5/8 In. Tube Diameter


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Select your vehicle details above to ensure item compatibility.

Ships by 03/30/15
  • Legendary header performance that's over 50 years in the making
  • 14-gauge steel tube construction for excellent life span, custom designed to fit your exact vehicle
  • Available in three different styles to complement your vehicle and needs
  • 50 State smog legal - includes all required smog equipment and mounting locations
  • Comes with a custom gasket for no-leak fit and performance
  • Ceramic-Thermal coating resists and absorbs engine heat for cooler, more efficient performance
  • Includes O2 sensor bosses
  • Lifetime Warranty

Doug Thorley's tradition of excellence in performance upgrades started in the 1950s and continues to this day. By combining craftsmanship with devoted attention to details, they have created high quality headers for the hot rod scene.

Your next Doug Thorley Header is available in one of the following configurations:

Tri-Y Headers: engineered to match firing sequences and minimize exhaust resistance. Maximum torque and power gains through 4500 RPMs, increased fuel economy.

Shortie Headers: designed to fit vehicles with limited space under the hood. Easy to install, specially designed to maintain emissions mounting positions for compliance with the strictest smog standards. Improves performance, enhances gas mileage.

Long Pipe Headers: popular for high performance street scene, tuned for maximum power throughout entire RPM range thanks to larger, longer primary tubes. 50-state street legal, improve your mileage by 2-3 MPG.

All Doug Thorley Header models are constructed of 14-gauge steel for ultimate longevity. Custom designs and tunes are engineered to perform and fit flawlessly under your hood. Coated inside and out with a Ceramic-Thermal Coating that protects your header from the elements and withstands up to 1,400 degrees F, these Doug Thorley headers promote exhaust velocity and absorb up to 40% of the engine temperature to keep your engine cooler and running more efficiently.

Your Doug Thorley Header comes with O2 sensor bosses, smog equipment, and a custom gasket for 50-state legality and a leak-free fit. Backed by a Lifetime Warranty.

Doug Thorley THY-367Y4-DA-C fits:

  • 1973-1991 Chevrolet Blazer
  • 1973-1987 Chevrolet C/K Pickup
  • 1973-1991 Chevrolet Suburban
  • 1973-1987 GMC C/K Pickup
  • 1973-1991 GMC Jimmy
  • 1973-1991 GMC Suburban