Injen SES1230H Equal Length Long Tube Stainless Steel Headers

The Injen SES1230H is an equal-length, long-tube header engineered specifically for the H4-2.0L boxer engine platform. Developed in-house by Injen's engineering team in Pomona, California, this header underwent extensive dyno testing and R&D to deliver a proven maximum gain of +7 horsepower and +8 ft-lbs. of torque — all without requiring any modifications to the vehicle.

Constructed from premium 304 stainless steel mandrel-bent tubing, the SES1230H features smooth, optimized equal-length tubes that minimize exhaust restriction and promote consistent, high-velocity gas flow throughout the RPM range. Precision CNC-machined flanges and thick collector flanges ensure a leak-free seal and long-term durability. Every weld is hand TIG-welded by certified craftsmen, delivering race-proven strength and a clean, professional finish.

Key Features:

• Dyno-verified gains of up to +7 HP and +8 ft-lbs. of torque
• Premium 304 stainless steel mandrel-bent tubing construction
• Optimized equal-length tube design for improved exhaust scavenging and performance
• Precision CNC-machined flanges for a leak-free, secure fit
• Hand TIG-welded by certified craftsmen for race-proven strength
• Uses all factory mounting locations and retains all factory O2 sensors
• Includes all necessary hardware for a hassle-free, no-modification installation
• Engineered and manufactured in Pomona, California, USA
• Backed by Injen Technology's Limited Lifetime Warranty

California Emissions Notice: This part is not CARB exempt and is not legal for sale in California or for use on vehicles registered with the California Department of Motor Vehicles.

WARNING: This product can expose you to chemicals including Chromium, Nickel, and Cobalt, which are known to the State of California to cause cancer.