BMW F90 M5 Catless Downpipes

These aftermarket parts replace the factory downpipes, which include catalytic converters, to increase exhaust flow and potentially boost engine power. The set includes four downpipe sections wrapped in heat-shielding material and fasteners for installation. Catless downpipes can increase horsepower by approximately 15-20% without tuning and up to 50% with tuning. However, using them without proper engine tuning can cause engine damage. The BMW N63 engine, which these downpipes fit, is found in models such as the 550i, X5, X6, 750i, and 650i.  

• An aerobic sensor and oxidation catalyst may be installed on the manifold to control exhaust emissions and monitor combustion quality.
• The material selection of the manifold needs to consider high-temperature corrosion and durability.
• Manifold design varies Compatible With different types of engines, such as gasoline engines and diesel engines.
• The shape and material of the manifold can also have an impact on engine acoustic characteristics.
• The optimized manifold design reduces the backflow of exhaust gases and the back pressure of the exhaust system.

WARNING:

Cat-less Downpipes are for OFF ROAD USE ONLY. Using these will result in a check engine/service engine soon light. Federal and many state laws prohibit the removal, modification or rendering inoperative of any part or element of design effecting emissions or safety on motor vehicles used for transporting persons or property on a public street or highway.