Active Autowerke BMW B58N X5-40i X3-40i X7-40i 540i 640i 740i AFlow Catted Downpipe (2025 and newer) 435I Made in the USA

Made in the USA

These ultra high flow catalytic converters outperform stock converters and provide a reliable solution to the most common catalytic converter problems

Constructed from an all aluminum cast body

Special thanks goes out to Frank Smith and the guys at Tuning Tech

Active Autowerke BMW B58N X5-40i X3-40i X7-40i 540i 640i 740i AFlow Catted Downpipe (2025 and newer) 435I Made in the USANO PERFORMANCE TUNE NEEDED. Active Autowerke BMW B58N Gen 3 Catted Downpipe this is not for M340 and M440 B58N Gen 3 which also incorporates a new GPF into the downpipe. NOTE: Fitment applies to US model cars only unless specifically stated. We cannot guarantee fitment to non US model cars. BMW introduced a new valvetronic, single turbo version of its direct injection engine for the later F Chassis models beginning in 2016 and carried over to the G