The J’S Racing XA-H3 4-2-1 Stainless Exhaust Manifold is one of the most respected naturally aspirated headers for the EG6 Civic SiR.
Unlike many 4-1 race headers that focus mainly on peak horsepower, the XA-H3 uses a 4-2-1 layout optimized for mid-range and top-end torque, making the car faster and more responsive in real-world driving and circuit use.
Performance Characteristics
- Stronger low-to-mid RPM torque than typical 4-1 headers.
- Improved throttle response when exiting corners.
- Maintains good power up to VTEC and redline.
- Handmade stainless construction with lightweight tubing.
- Developed through extensive dyno and track testing by J’S Racing.
1. Designed with serious consideration on torque that support the horsepower and overall performance.
5. Repairs are available at actual cost by J’S Racing.
**Only the head side gasket is included.















