Injen

Injen Technology Exhaust Systems - American Engineering & Manufacturing Excellence

Founded by entrepreneur Ron Delgado in 1998 as a sister company to RD Metal Works, Injen Technology has emerged from humble beginnings into an industry-leading performance manufacturer based in Pomona, California—just miles from the famous Pomona Winter Nationals Top Fuel Raceway. What began in 1988 as a mission to perfect polishing techniques grew into a full-fledged quest to develop industry-changing design and manufacturing solutions for the automotive aftermarket.

Innovation Through Patents & Proprietary Technology

Injen Technology currently holds more than 10 patents, with four specifically covering the tuning process of air intake systems—something no other manufacturer can claim. Their breakthrough MR Technology is a patented venturi stepping process that enables engineers to "tune" an intake for maximum power by adjusting airspeed at the MAF (Mass Air Flow sensor) during the design phase. This pioneering approach allows enthusiasts to achieve better performance without triggering check engine lights—a revolutionary advancement when dealing with modern OBD-II regulations.

The company's commitment to research and development is backed by in-house dynos, laser CMM (Coordinate Measuring Machines), and SolidWorks engineering software to ensure precise fitment and documented power gains. Every Injen exhaust system is dyno-tested with results published, proving their commitment to verifiable performance improvements rather than marketing claims.

American-Made Quality & Craftsmanship

All Injen Technology performance exhaust systems are handcrafted in their California facilities located in Pomona and Coachella, with headquarters in Montclair, California. Every system features hand TIG-welded construction from mandrel-bent 304 stainless steel tubing. Mandrel-bending ensures the tubing maintains its shape and size throughout the entire length, providing smooth, unrestricted airflow without the crimping or dimensional changes associated with crush-bent piping.

From investment-cast flanges to custom hangers, every component is engineered for durability and performance. All systems include complete tubing, mufflers, and hardware necessary for hassle-free installation using factory mounting points—no cutting, drilling, or vehicle modification required.

Exhaust Engineering & Design Philosophy

Injen's exhaust systems utilize performance-stepped pipe designs that keep flow rates consistent throughout the length of the exhaust. This engineering approach not only adds measurable horsepower and torque but also helps maintain the exhaust tone exactly where Injen designed it to be throughout the entire rev range. The stepped piping design transitions between larger diameter front sections and optimized rear pipes, balancing flow velocity with volume for maximum efficiency.

Each system is uniquely designed to offer an aggressive sound that delivers massive power gains while maintaining drivability. The exhaust tone is carefully engineered to produce a crisp, clean, deep rumble at idle and an aggressive roar when pushing the vehicle's limits—avoiding the drone and harshness common in poorly designed systems.

Vehicle-Specific Applications & Proven Results

Subaru WRX/STI (2015-2021): The Injen cat-back exhaust system was designed from the ground up to complement the aggressive styling and blistering performance of these sporty sedans. The custom dual-muffler design features performance-stepped piping utilizing 76mm and 60mm sections, with quad burnt titanium-look tips. V-Band clamps and flanges provide simple, leak-free installation. Dyno-proven gains of up to 13 hp and 11 lb-ft of torque transform the turbocharged boxer engine's character.

Honda Civic 1.5L Turbo (2016-2021): Aggressively designed cat-back featuring a large 76mm 304 stainless steel front section that Y's into dual 60mm rear pipes, each capped with 3.50" burnt titanium exhaust tips for that classic JDM aesthetic. The system delivers improved performance you can hear and feel, whether hitting the track or commuting to work.

Toyota 86/Subaru BRZ/Scion FR-S (2013-2020): Direct-fit systems manufactured from 60mm mandrel-bent 304 stainless steel deliver dyno-proven gains of up to 7 hp and 8 lb-ft of torque for the naturally aspirated FA20 boxer engine. Designed to enhance the flat-four's unique character without sacrificing daily drivability.

Hyundai Sonata/Kia Optima 2.0L Turbo: Performance exhaust systems featuring stepped pipe design with 76mm and 60mm sections achieve dyno-proven gains of up to 13 hp and 11 lb-ft of torque. Engineered specifically for the turbocharged Theta II engine platform.

Mitsubishi Lancer (Multiple Generations): Full 60mm piping systems featuring Injen's classic round JDM-style rear mufflers deliver dyno-proven gains ranging from 6-8 hp and 5-7 lb-ft of torque depending on application. Premium 304 stainless steel construction throughout.

Premium Construction Features

304 Stainless Steel: Every Injen exhaust system is constructed from premium-grade 304 stainless steel for the highest level of tensile strength and rust resistance. The polished finish on mufflers impresses anyone inspecting the undercarriage, while burnt titanium-look exhaust tips offer superb aesthetics.

Hand TIG Welding: Every joint is hand TIG-welded by skilled technicians in California for strength, durability, and aesthetic appeal. The precision welding ensures leak-free performance and long-term reliability.

Investment Cast Flanges: High-quality investment-cast flanges provide superior sealing and durability compared to stamped alternatives. These precision-manufactured components ensure proper fitment and eliminate exhaust leaks.

V-Band Clamps: Select systems utilize V-Band clamps and flanges for the simplest, quickest installation possible with superior sealing characteristics and easy serviceability.

Factory Mounting Points: All systems use factory mounting points for simple and convenient placement, ensuring compatibility without modification to the vehicle.

Warranty & Support

Injen Technology backs all exhaust systems with their world-renowned Limited Lifetime Warranty covering defects in materials and workmanship under normal installation and usage conditions. This warranty demonstrates Injen's confidence in their American manufacturing quality and commitment to customer satisfaction.

Why Choose Injen Exhaust Systems

  • 100% Made in USA - Handcrafted in Pomona and Coachella, California
  • Dyno-Proven Performance - Every system tested and documented with real gains
  • Patented Technology - Over 10 patents including proprietary engineering processes
  • Mandrel-Bent Tubing - Smooth, unrestricted airflow throughout entire length
  • Hand TIG-Welded - Superior craftsmanship and durability
  • Limited Lifetime Warranty - Confidence in quality and longevity
  • Complete Installation Hardware - Everything needed for hassle-free installation
  • Aggressive Sound Engineering - Deep rumble at idle, aggressive roar at WOT

Key Features:

  • Mandrel-bent 304 stainless steel construction
  • Performance-stepped pipe designs for optimal flow
  • Burnt titanium aesthetic exhaust tips
  • Hand TIG-welded joints throughout
  • Investment-cast flanges for superior sealing
  • V-Band clamps for easy installation (select models)
  • Factory mounting point compatibility
  • Dyno-tested and documented power gains
  • Made in USA with lifetime warranty

Browse our complete selection of Injen Technology exhaust systems with detailed specifications, sound clips, and dyno charts for your specific vehicle application.