S58 Cast Stainless Steel Downpipes

The CTS Turbo BMW S58 Downpipes are engineered to replace the restrictive factory catalytic converter, maximizing exhaust flow for increased power gains in your BMW X3M/X3MC and X4M/X4MC models. Constructed from CAST T304 stainless steel and featuring hand TIG welded and back-purged construction, these downpipes are built for years of reliable performance. Designed using the latest CAD technology, they ensure a perfect fitment in place of the stock unit. The enhanced exhaust flow not only boosts performance but also transforms your vehicle's sound, producing a louder, deeper growl with a more pronounced exhaust crackle on downshifts and a confident punch during upshifts. Key features include direct replacement of the factory catalytic converter, uncompromising performance upgrades, and an incredible sporty exhaust note that remains subtle when cruising. The construction ensures no drone when used with the factory exhaust system. This product is sold for competition use only and is not legal for use in highway or street vehicles. To address the Check Engine Light (CEL) that will occur after installation, proper stage 2 tuning software must be used.