Unlock more power from your 3rd Gen Toyota 4Runner 3.4L V6 with the Doug Thorley THY-507-C Long Tube Header Kit, built for models without an external EGR tube. This complete package includes silver ceramic-coated long tube headers and a matching performance Y-pipe to optimize exhaust flow from the heads to the rest of your exhaust system.
The 3:1 header design boosts torque and horsepower across the RPM range, improving both low-end grunt for off-road driving and mid-range pull for highway cruising. Built from 14-gauge steel with a heat-resistant silver ceramic coating, these headers deliver exceptional durability and long-lasting performance.
The included Y-pipe features mandrel bends for smooth exhaust flow and a 2.5” outlet that must be welded to your existing exhaust inlet for a secure, leak-free fit.
Key Specs:
- Fits: 1996–2002 Toyota 4Runner 3.4L V6 (5VZ-FE) without external EGR tube
- Includes: Long tube headers + Y-pipe kit
- Header Style: 3:1
- Material: 14-gauge steel with silver ceramic coating
- Primary Tube Diameter: 1-1/2"
- Collector Diameter: 2-1/4"
- Y-Pipe Inlet Diameter: 2-1/4"
- Y-Pipe Outlet Diameter: 2-1/2" (weld-on)
- Flange Thickness: 3/8"
- Hardware Included: Yes
- Uses factory manifold gaskets
- CARB E.O. #: D-540-6 (50-state legal)
- Warranty: Limited Lifetime to original purchaser
Performance Benefits:
- Increases horsepower and torque across the powerband
- Improves throttle response
- Reduces exhaust backpressure for better combustion efficiency
- Durable silver ceramic coating resists heat and corrosion
- Includes full Y-pipe kit for maximum performance
