---Manufactured from highest quality T304 grade stainless steel ---Directly replaces the OEM catalytic converters for ease of fitment ---Built in flexi's to reduce exhaust strain and prolong gasket life ---Removing the catalytic converters is an easy way to gain throttle response and power whilst opening up the capabilities for more power in the future ---Sold for off-road / track use only Compatible with: Audi S4 / S5 B9 Quattro 3.0 V6 TFSI 2015-2019.