ARM Motorsports Catless Downpipes for Audi 4.0T

The ARM Motorsports 40TDP catless downpipes are engineered to significantly enhance the performance of Audi 4.0T engines by reducing exhaust backpressure. These downpipes replace the restrictive, large-volume OEM catalysts, which are a major bottleneck for power and turbo response. By removing this restriction, the turbos can spool up more quickly, leading to increased torque and horsepower lower in the RPM range, as well as improved throttle response. Constructed from durable SS304 stainless steel, the ARM 4.0T downpipes are built for longevity. They feature a substantial 4.4" x 3" collector at the turbo outlet, mated to an OEM-style 5-bolt flange compatible with various turbocharger upgrades. A stainless steel flex section is integrated to absorb stress from aggressive driving maneuvers, ensuring the integrity of the exhaust system. The downpipes utilize OEM transmission mounting brackets for added security. They transition to a 2.25" 3-bolt flange, designed for a direct fit with OEM or ARM 4.0T midpipes. The fitment guide specifies compatibility with a range of Audi models including the C7 and C7.5 S6, S7, RS7, and D4 A8, S8, all equipped with the 4.0T engine. Installation includes all necessary gaskets and hardware, such as turbo gaskets, midpipe gaskets, turbo studs, nuts, and midpipe bolts. ARM Motorsports backs these downpipes with a lifetime warranty covering craftsmanship and fitment defects.