Doug Thorley Tri-Y Header 1981-1984 Pickup & 4Runner 22R (O2 Sensor & Vertical Air Injection)(Carb. Only) THY 542Y-SO-C
Doug Thorley Headers THY-542Y-SO-C long tube tri-y headers deliver the ultimate in performance and gas mileage for your 1981-1987 Toyota Pickup Truck, 4-Runner. Doug Thorley Headers is the originator of the tri-y header design, which is the most efficient way to increase horsepower and torque over a broad RPM range, and more importantly the range where you use it most. That better exhaust flow produces noticeable gains in horsepower and torque output, while increasing fuel efficiency.
The headers are manufactured using heavy duty 14GA steel tubing, and super flat 3/8 inch head flanges. They are then silver ceramic coated inside and out, which looks great, drastically reduces under-hood temperatures, and creates a strong barrier to protect the headers from the environment.
APPLICATION SPECIFICS: 1981-1984 Toyota Pickup Truck, 4-Runner, 22R motor (Carb. ONLY), o2 sensor, vertical air injection, manual transmission only, 2WD & 4WD.
- DRIVE: 2WD & 4WD
- PRIMARY/COLLECTOR: 1 1/2" - 2 1/4"
- HEADER EXIT: DRIVER
- CARB E.O. # D-540-5
- Includes Gaskets & Studs
- Does not fit automatic transmission.
- Fits 5-speed models w/ hydraulic clutch only.
- For Legality under CARB regulations the connector/Y-pipe assembly must be used on vehicles originally equipped with catalytic converter.
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