Eddy Catalytic Downpipe

The Stone Exhaust Eddy Catalytic Downpipe is a high-performance exhaust component designed to improve engine performance on various BMW and Toyota B58 applications. By utilizing patented eddy catalytic technology with an arc-packaging method, the downpipe creates a vortex effect during the turbine emissions process. This design purifies exhaust gases while maintaining optimal back pressure, effectively increasing horsepower and torque compared to conventional straight downpipe designs. At lower RPMs, the unit provides clean emissions, while higher RPM operation activates the vortex effect for increased performance. Crafted from premium SUS304 stainless steel, this downpipe features dual cross-welding and direct spot welding techniques for maximum durability at the high-temperature turbo flange. The unit is designed using 7-axis CNC bending and 3D-scanned OEM data to ensure 100% OEM fitment with no modifications required. It also includes patented O2 sensor technology designed to provide accurate real-time data to prevent check engine lights, ensuring an error-free installation. This downpipe is specifically engineered for non-OPF models with the B58 engine, including the BMW 1 Series (F20/F21), 2 Series (F22/F23), 3 Series (F30/F31), 4 Series (F32/F33/F36), 5 Series (G30/G31), 7 Series (G11/G12), X3/X4 (G01/G02), Z4 (G29), and the Toyota A90 Supra. Users should note that this product modifies the stock exhaust system and must comply with local, state, and federal emissions laws.