3-Inch Large Bore Downpipe and Hi-Flow Sports Cat

The Milltek Sport SSXAU431 is a large bore downpipe and hi-flow sports cat system engineered to enhance your vehicle's performance and exhaust sound. This system utilizes 3-inch diameter pipework, constructed from aircraft-grade T304 stainless steel, which is larger than standard OEM parts. This increased diameter provides more space for exhaust gases to exit the engine, leading to improved efficiency and a noticeable boost in performance. The downpipe incorporates a 200-cell high-flow catalytic converter and is designed to connect directly to the stock turbocharger, offering significantly increased turbo response over restrictive factory downpipes. This downpipe is specifically designed for use with Milltek's 3-inch cat-back exhaust systems. While it may potentially work with other brands, modifications might be necessary. Installation requires a Stage 2 ECU remap to optimize performance. It is designed to fit the 225HP Audi TT MKI Quattro model. However, potential clearance issues may arise on roadster models due to additional bracing. This product is not for sale or use in the state of California on any pollution-controlled vehicle. The hi-flow sports catalysts and downpipes are covered by a 2-year or 50,000-mile warranty when used in conjunction with other Milltek products.