Sports Series High Flow Catted Downpipe for 2018-23 M5/M8 S63M Engine Region Spec:US Spec or Non OPF It features 660 cubic inches

It features 660 cubic inches of very efficient high density bar  & plate core (35% larger) versus the factory 425 cubic inches of less efficient tube & fin core

The pictures below show the factory "ball" joint cut in half (to show in the interior) versus our CNC solid stainless steel billet "ball" joint

The ducting shroud kits are available in aluminum

The factory diverter valves were causing an issue of not being able to hold up against the rigors of high boost application

Sports Series High Flow Catted Downpipe for 2018-23 M5/M8 S63M Engine Region Spec:US Spec or Non OPF It features 660 cubic inchesIntroducing our new Sports Series High Flow Catted Downpipes for your twin turbo S63M engine! Fits 2018 23 M5 (F90) & 2018 23 M8 (F92 F93). Key Features: Made in the USA! Manufactured in house. Now available for the 2018+ BMW F90 M5 & 2018+ F92 F93 M8 S63M Engines! High Flow 200 cell metallic catalytic converter Higher Max Horsepower Power Curve Higher Initial Torque Curve. Torque curve hits faster and higher and longer. Better throttle response and