High Volume Downpipe Upgrade GESI Cat

The PRL Motorsports High Volume Downpipe Upgrade is engineered to enhance efficiency and airflow for the 2016-2021 Honda Civic 1.5T. It boasts investment-cast 304 stainless steel ends with CNC pocketing for a smooth transition to the 4.50" OD mid-pipe. This downpipe incorporates a 400 CPSI GESi G-Sport catalytic converter, specifically developed for direct injection engines to ensure excellent exhaust flow. To handle high temperatures, all components are fully back-purged. The wide cast inlet design effectively blends turbine outlet and wastegate gases, reducing restriction, while the outlet smoothly tapers to connect with aftermarket or factory front pipes. For maximum performance, it is recommended to pair this downpipe with PRL's 3" Front Pipe Upgrade. All necessary gaskets and stainless hardware are included for a seamless installation. Important considerations: This downpipe is NON CARB LEGAL and intended for OFF-ROAD USE ONLY. It is NOT FOR SALE IN CALIFORNIA, NEW YORK, or any states adopting CARB guidelines. No ECU calibration is required, and it features an EPA-compliant catalytic converter. It is compatible with factory and most aftermarket front pipes without needing an adapter. However, it is NOT compatible with PRL's Big Turbo Kit, as that kit includes a specifically designed downpipe. Key features include increased power and exhaust flow across the entire powerband, decreased backpressure, cooler exhaust gas temperatures, and a 400 RPM increase in turbocharger spool. The kit includes the downpipe assembly and a hardware bag.