ARM Motorsports S55 M3 M4 Resonated Downpipes Race Competition Use Only

HIGHLIGHTS • Up to +30whp / 30wtq• Enhanced Exhaust Note• 304 Stainless Steel • Improved Turbo Spool    PROFILE The ARM F82 M4 Downpipes are the ultimate solution for improving power, throttle response, and exhaust note on your S55 powered M4.  Our goal for the ARM M4 Downpipes was to provide a solution that would maximize power and torque, fit perfectly, and sound extraordinary. Catless downpipes are considered a standard upgrade for any F82 M4 owner looking to safely push their S55 engine beyond basic Stage 1 tuning.  With Stage 2 and up tuning, higher boost increases back-pressure at the OEM catalysts and chokes the S55's turbochargers, causing them to work harder and shortening their life.      The ARM F82 M4 Downpipes relieve the stressful back-pressure caused by high-boost tunes, allowing the exhaust to flow freely, increasing power and torque, all while extending the longevity of your S55's turbochargers.  On our test car, after installing our F80 downpipes and swit