Our 2019-2021 BMW F97 F98 x3m x4m  S58 Downpipes are made from the same mandrel bent Polished, Fully TIG welded T-304 Stainless Steel with CNC Machined Flanges like all of our Exhaust products and feature our Limited Lifetime warranty.       ***This product is intended to be used only on racing vehicles on closed courses, and not for use on roads or vehicles otherwise subject to emission control requirements***   *Please note this product is made to order and build time takes about 3-4 weeks after placing order.*