Martelius x BGRS AE86 "XL" Fast Road / Track Header for 16V and 20V 4AGES

Regular price $820.00

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The "XL" Group Header is the epitome of performance and precision, meticulously designed to deliver exceptional power and versatility for a wide range of applications. Developed in collaboration with Martelius, this header sets a new standard for performance headers, catering to the demands of competitive rally events, spirited driving, and everyday street use.


  • Specifically designed for GZE, 7AGE, and modified 4AGE engines, offering increased power and performance over standard headers.
  • Innovative 4-2-1 design optimized for competitive rally events, ensuring a broad power band for maximum performance.
  • Long secondaries promote a strong mid-range torque while maintaining high-end power.
  • Engineered for engines outputting between 150 - 215 bhp or up to 240 hp for GZE applications.
  • Spec'd by Battle Garage for hassle-free installation with O2 sensors in the factory position, eliminating the need for O2 sensor wire extensions. Includes an extra wideband O2 sensor bung for added versatility.
  • Direct bolt-on compatibility with catalytic converters in the factory position, offering convenience and flexibility.
  • Constructed from high-quality stainless steel for exceptional durability and longevity.
  • Clearances designed to accommodate factory oil filter location and oil filter adapter blocks.
  • Primary tube diameter: 42mm -> Secondary tube diameter: Long 47mm -> Collector diameter: 57mm / 2.25"


The "XL" Group Header is engineered to optimize power delivery throughout the RPM range, making it ideal for various driving applications including hill climbs, rally events, drifting, and spirited street driving. Its meticulously designed 4-2-1 configuration ensures maximum exhaust scavenging efficiency, resulting in improved throttle response, torque, and horsepower.


  • "XL" Group Header
  • All necessary mounting hardware
  • OEM 16V Exhaust Hardware can be found here. 


Designed to fit seamlessly with 16V and 20V 4AGE engines, this header offers a perfect fit and hassle-free installation. Whether you're upgrading for performance or reliability, the "XL" Group Header delivers unmatched versatility and performance for your AE86.