Description CTS Turbo BMW F10 M5/M5C & F06/F12/F13 M6/M6C High-Flow CATS are made to maximize exhaust flow for highest power gains. Designed using the latest in CAD technology; this part is made to fit perfectly in place of restrictive factory catalytic converter. Manufactured from CAST T304 stainless steel; hand TIG welded and back-purged to ensure years of reliable performance. In addition to unleashing the power and performance of your 4.4 Twin Turbo, our High-Flow CATS will make your vehicle sound like it really should. When installed with factory exhaust it produces a louder and deeper growl with much more pronounced exhaust “crackle” on downshift. While up-shifting you will enjoy a confident “punch!” as you bang through all 8 gears. The sound will be even louder if you already have an aftermarket exhaust system. Product Details: Full 3″ from the turbos to the exhaust connection Designed and tested on a real car in the real world 200 cell catalytic converters (race cats) Cast T304 stainless steel, TIG welded back-purged construction Replaces restrictive factory catalytic converter Great power upgrade with uncompromising performance Incredible sporty exhaust sound, subtle when cruising No drone with factory exhaust Fitment: 2012-2016 F10 BMW M5 2012-2016 F10 BMW M5 Competition 2012-2016 F06/12/13 M6 2012-2016 F06/12/13 M6 Competition To remove the CEL that will occur, proper stage 2 tuning software must be used.