Doug Thorley Headers THY-359Y-C GM G-Body LS Motor Swap 1978-1988

Doug Thorley Headers THY-359Y-C What better way to enhance your vehicle than a beautiful set of Tri-Y headers that will ensure you're getting the most power possible out of your LS motor! 

Backed by over 60 years of knowledge and experience, our headers are designed to outflow stock exhaust manifolds by leaps and bounds.

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, and that is why they are the best street header available.

To make these headers last, we built them using industry leading 14-gauge steel tubing with 3/8" thick flanges.

Topping all of that off, our headers come beautifully ceramic coated to greatly reduce under-hood temperatures and protect the headers from the environment. 

All 100% American made, and backed by our lifetime warranty. Install these long tube headers today and feel your vehicle's true power potential!

Brand: Doug Thorley Headers

Manufacturer's Part Number: THY-359Y-C

Part Type: Headers

Product Line: Doug Thorley Headers

Header Style: 4:2:1 Tri-Y

Material: Steel

Finish: Silver Ceramic Coated

Weld Up: No

Primary Tube Diameter: 1-3/4"

Primary Tube Gauge: 14 Gauge

Collector Attachment: 3 Bolt Flange

Collector Diameter: 3"

Tuned: No

Flange Thickness: 3/8"

Bolts and/or Studs Included: Yes

Gaskets Included: Yes

Adapters/Reducers Included: Yes, 3”– 2-1/2”

Y-Pipe (Crossover) Included: No

Y-Pipe Inlet Diameter: No

Y-Pipe Outlet Diameter: No

Catalytic Converter(s) Included: No

Quantity: Sold as a Complete Kit

CARB E.O. #: NOT LEGAL FOR STREET USE ON POLLUTION CONTROLLED VEHICLES

Warranty: Limited Lifetime to original purchaser

WARRANTY:

Doug Thorley Headers carry a lifetime warranty against defects in material and workmanship to the original purchaser. Chrome plated items carry no warranty for finish, other than to be free from defects at the time of purchase, prior to installation. This warranty does not cover damage caused by misuse, abuse, collisions, improper installation, alterations, off-road use, racing use, commercial use, "burn-out" or cracking caused by excessive heat, superchargers, or external heat insulating wrap. Rust or corrosion that occurs after the product is installed is also not covered.