BMW G8X M3/M4 2020-2025 S58 Race Sport Stainless 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. Our S55 Downpipes are 3″ diameter and then transition into 2.5″ diameter piping. For peace of mind we have added a Stainless Steel Bellows”Flex pipe” to our down pipe.    For the 2021 to 2025 BMW G80 M3, G82 M4, G83 M4 Convertible, and the G81 Wagon. (Power increases available soon)  * 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 5-6 weeks after placing order.*