With sports catalyst:
+245$ GESI 10030 300 cell Euro-3
+440$ GESI HO 300 cell Euro-5

Downpipe for BMW F07 GT, F10, F11, F18, F06, F12, F13, F01, F02, X5 E70, X6 E71 with the N55 series engine (before 07.2014 year of issue) made of high quality 304AISI stainless steel. The design of continuously curved piped with the increased pipe diameters without sharp tapering excludes the chance of the occurrence of turbulence in the exhaust gas flow and improves the capacity of the exhaust gas flow. Lowered resistance to exhaust stream reduces the turbine impeller temperature by 10%, therefore increasing its operational life. Such pipes increase the capacity of the engine with limited indicators by 15 - 20 hp. and improves the quality of the torque curve. This downpipe is required for installation in case of Stage-1 (up to +45 hp) and Stage-2 (up to +90 hp) chip tuning. This downpipe gives the exhaust system a more intensive and aggressive sound.
Besides, it’s used as a credible alternative to catalysts’ removal.