Active Autowerke BMW B46 G2X 230i 330i 430i Catted DownpipePlease note that we install the gasket into the downpipe flange as some were damaging the gasket on installation. Active Autowerke BMW B46 Catted Downpipe BMW introduced a new valve tronic, single turbo version of its direct injection engine for the later F Chassis models beginning in 2016 and continuing into the G chassis models. The Active Autowerke B46 downpipe for the 230i, 330i and 430 helps unleash some of the potential that is restricted by the