Invidia 2016+ Honda Civic EX / Touring / SI 1.5T Catted 70mm Downpipe

Unlock true turbo performance with the Invidia Downpipe with High Flow Catalytic Converter—a critical upgrade for any forced induction platform looking to unleash horsepower, torque, and response. The OEM downpipe is one of the most restrictive components in a turbocharged exhaust system, bottlenecking flow directly after the turbo. Invidia solves this by replacing the factory unit with a free-flowing design engineered to minimize backpressure and maximize velocity. At the heart of the system is a high-efficiency, low-cell-count metallic catalytic converter, which maintains emissions compliance while drastically reducing restriction compared to stock. This high flow cat allows for significant gains in turbo spool, throttle response, and peak output—especially when paired with a proper tune. The result is faster turbo response, higher boost thresholds, and a deeper, more aggressive exhaust tone. Constructed from mandrel-bent SUS304 stainless steel with large diameter piping, the Invid