Description:
Wake up your 3rd Gen Toyota 4Runner with the proven performance of the Doug Thorley THY-509Y-C Tri-Y Header, designed exclusively for the 1996–2002 4Runner with the 2.7L 3RZ-FE inline-4 engine.
Built with a 4:2:1 Tri-Y design, this header improves low-end torque, boosts mid-range horsepower, and enhances throttle response across the widest RPM range possible. Ideal for both daily driving and off-road performance, the Tri-Y layout delivers smooth, usable power where you need it most.
Constructed from 14-gauge steel and coated in a durable silver ceramic finish, this header resists extreme heat and corrosion while looking great under the hood. The 3/8” thick flanges ensure a long-lasting, leak-free seal, and installation is straightforward using your factory gaskets with included hardware.
Key Specs:
- Fits: 1996–2002 Toyota 4Runner 2.7L 3RZ-FE inline-4
- Header Style: 4:2:1 Tri-Y Header
- Material: 14-gauge steel with silver ceramic coating
- Primary Tube Diameter: 1-1/2"
- Collector Diameter: 2-1/4"
- Flange Thickness: 3/8"
- Uses factory gaskets (not included)
- Includes all necessary hardware
- CARB E.O. #: D-540-6 (50-state legal)
- Warranty: Limited Lifetime to original purchaser
Performance Benefits:
- Broad torque and horsepower gains across RPM range
- Increased throttle response
- Better exhaust flow for more efficient engine performance
- Perfect balance of daily drivability and off-road power
