411 Works Stainless Steel O2 Bung Coped | Precision CNC Machined | Exhaust Fabrication Component Overview The 411 Works Stainless Steel O2 Bung Coped is a high-quality exhaust component designed for precise installation of oxygen sensors in custom exhaust setups. Ideal for Subaru enthusiasts and fabricators working on WRX, STI, BRZ, or other models requiring reliable O2 sensor mounting, this bung ensures a secure and accurate fit for sensor placement. Its coped design allows it to seamlessly integrate with exhaust tubing ranging from 2.5 to 4 inches in diameter, making it versatile for various exhaust configurations. Manufactured in-house on HAAS CNC machines, the bung is crafted from premium 304L stainless steel sourced from Sweden, reflecting 411 Works’ commitment to quality and durability. The precision machining process guarantees consistent thread quality and dimensional accuracy, essential for leak-free sensor installation and long-term reliability. Made in the USA, this component stands out for its meticulous engineering and robust material selection, tailored for demanding performance applications. For Subaru owners focused on custom exhaust builds or repairs, this O2 bung offers a dependable solution that maintains sensor integrity and exhaust system efficiency. Its compatibility with a wide range of tube sizes and the standard M18x1.5 thread pitch ensures it fits most Subaru oxygen sensors without modification. Using this bung supports accurate air-fuel ratio monitoring, which is critical for tuning and engine management on turbocharged and naturally aspirated Subaru platforms. Features & Specifications This 411 Works Stainless Steel O2 Bung is engineered for universal exhaust applications and features a coped design to fit 2.5" to 4" diameter tubing. Constructed from 304L stainless steel, it delivers corrosion resistance and precision fitment for Subaru enthusiasts seeking reliable sensor mounting in custom exhaust fabrication. Brand: 411 Works Product: Stainless Steel O2 Bung Coped Part Number: 411-O2WBSSM18X155 Fitment: Universal fit for 2.5" - 4" diameter exhaust tubing Material: 304L Stainless Steel Finish: Natural stainless steel Construction: Precision CNC machined Origin: Made in USA with Swedish steel Thread Size: M18x1.5 Design: Coped to fit tubing diameter range Key Benefits Precision Fitment: CNC machining ensures exact thread dimensions and coped profile for a secure, leak-free sensor mount. Durability: 304L stainless steel construction resists corrosion and withstands high exhaust temperatures common in Subaru turbo applications. Versatility: Designed to fit a broad range of exhaust tube sizes (2.5" to 4"), accommodating various custom and OEM exhaust setups. Made in USA Quality: Manufactured domestically with premium Swedish steel, ensuring consistent quality control and material integrity. Subaru Compatibility: Standard M18x1.5 thread fits most Subaru oxygen sensors, supporting accurate engine management and tuning. Fabrication Friendly: Coped design simplifies welding and integration into exhaust systems, reducing installation time and complexity. What's Included 1× 411 Works Stainless Steel O2 Bung Coped Installation & Compatibility Installation of the 411 Works Stainless Steel O2 Bung requires welding skills and appropriate equipment to ensure a proper seal and sensor placement. It is a straightforward upgrade or fabrication component for experienced DIYers or professional exhaust shops. No special tools beyond standard welding gear are necessary. This bung is compatible with exhaust tubing between 2.5" and 4" in diameter and uses the common M18x1.5 thread size, which fits most Subaru oxygen sensors without modification. Professional Installation: Recommended for welding and leak-free sensor mounting Modifications Required: None beyond welding to exhaust tubing Verify Compatibility: Confirm tubing diameter and sensor thread size before installation Shop with confidence at Subimods—your Subaru parts specialists.
