N55 3.5-Inch Catted Downpipe

The Active Autowerke N55 Signature downpipe is engineered to reduce exhaust back pressure, allowing your turbocharger to spool more quickly and efficiently. This results in improved horsepower and torque output compared to the restrictive OEM downpipe. It features a 3.5-inch diameter pipe constructed from TIG-welded 304 stainless steel with a 1.5mm wall thickness, ensuring robust durability. This downpipe integrates a 4.5-inch GESI G-Sport Ultra High Output (UHO) catalytic converter, which is EPA registered and OBD2 compliant for use in 49 states. The converter utilizes GESI's proprietary precious metal loading technology and a 400-cell per square inch substrate to ensure greatly reduced emissions while maintaining high flow capacity. The catalytic core is capable of reaching operational efficiency within 9 seconds of startup and can withstand temperatures up to 1500°F. The product is made in Miami, Florida, and offers a modular design for potential future upgrades. It is rated for applications producing 500 to 850 horsepower and does not require a performance tune. **Important Fitment and Compliance Notes:** This downpipe is designed for F-Chassis N55 cars manufactured from 09/2013 onwards. It is important to note that these catalytic converters are not legal for use on vehicles registered in the state of California due to specific state regulations. Additionally, fitment applies to US model cars only, and compatibility with non-US models cannot be guaranteed. The warranty on the catalytic core will be void if the vehicle exhibits excessive burble beyond stock levels, as this can physically damage the core.