High-Flow Catalytic Converter Downpipe System

The JHMotorsports Performance Race Header Modification with High Flow Cat Downpipes is engineered to optimize exhaust flow and enhance performance for the Audi RS5 B8-B8.5 models equipped with the 4.2L V8 32v FSI engine. The stock system's smaller diameter downpipes create a flow restriction and turbulence, hindering the engine's potential. This JHM system utilizes 2.75-inch 304 stainless steel piping, which has been identified as the optimal size for this engine's demands, preventing the choking effect experienced with 2.5-inch systems. The system features gasket-matched flanges and smooth-flowing transition collectors to ensure a seamless path for exhaust gases, eliminating hindrances and promoting optimal performance gains. It is constructed from durable 304 stainless steel, including the V-bands, and is HAND MADE IN THE USA. The kit includes the JHM Performance Race Header Modification, JHM High Flow Cat Downpipes, exhaust manifold gaskets, exhaust manifold nuts, and downpipe gaskets. This product is for racing competition use ONLY and is not legal for use in highway or street vehicles. The purchaser acknowledges and agrees that the vehicle will only be used for racing applications or off-road use. Installation requires sending in existing headers for modification, as core exchanges are not currently available due to low availability. The system is compatible with the JHM 2.75" Valved Performance Catback system. It is also subject to California Proposition 65 warnings regarding chemicals known to cause cancer, birth defects, or other reproductive harm.