Valvetronic Designs 400-Cell Catted Downpipes for the Lamborghini Urus and Audi RS Q8 4.0T are engineered to unlock performance while maintaining catalytic converters for a more refined driving experience. The high-flow 400-cell metallic catalysts improve exhaust flow and turbo response without the harshness or odor typically associated with catless setups.Designed as a direct bolt-on replacement for the factory downpipes, this system reduces backpressure and enhances overall sound character while retaining daily drivability. Built from premium stainless steel for durability under extreme heat, these downpipes are ideal for enthusiasts looking for increased responsiveness and a deeper exhaust note.Professional installation recommended. Tuning may be required to prevent check engine lights and achieve optimal performance.