Upgrade your BMW’s performance with RK Autowerks Catless Race Downpipes for the F10 M5 and F06 / F12 / F13 M6 equipped with the S63 engine. Designed to eliminate the restrictive factory catalytic converters, these downpipes dramatically reduce backpressure and allow your turbos to spool faster for sharper throttle response and immediate gains in horsepower and torque. Each set is engineered using advanced 3D scanning and prototyping technology to ensure perfect OEM-style fitment with no modifications required. Constructed from mandrel-bent T304 stainless steel and assembled with precision TIG welds and CNC-machined velocity stack flanges, RK Autowerks downpipes are built for durability, performance, and reliability. Key Features: Full 3.00" overall diameter Mandrel-bent T304 stainless steel tubing Precision TIG-welded construction Heavy-duty stainless steel v-band and exhaust flanges Factory O2 sensor locations retained with stainless steel bungs Designed to reduce underhood temperatures OEM fitment with no cutting or welding required Vehicle Fitment: 2012–2016 BMW M5 (F10) 2012–2016 BMW M6 Coupe, Convertible, Gran Coupe (F06 / F12 / F13) Important Notice:These catless downpipes are intended for off-road use only. Installation will trigger a check engine light and may not comply with federal or state emissions regulations. Always check local laws before purchase.