Active Autowerke BMW B58N M340i M440i AFlow Catted Downpipe (2025 and newer) Catted DP - option to add gasket:Catted DP w turbo flange gasket out-of-sync turbocharger sound that many

out-of-sync turbocharger sound that many owners have complained about

Cold start delete

There are also plans for a future resonator upgrade for those who prefer a smoother sound to their exhaust systems

When you thought it could not get any better

BASE PRIMA SUPERCHARGER DYNOJET RESULTS

Active Autowerke BMW B58N M340i M440i AFlow Catted Downpipe (2025 and newer) Catted DP - option to add gasket:Catted DP w turbo flange gasket out-of-sync turbocharger sound that manyNO PERFORMANCE TUNE NEEDED. Active Autowerke BMW B58N Gen 3 Catted Downpipe this is for M340 and M440 B58N Gen 3 which also incorporates a new GPF into the downpipe. NOTE that to remove the stock GPF downpipe requires 9 to 10 hours of labor as the subframe needs to be dropped. 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