Stone Exhaust A224NP catless downpipe for BMWs with the B46D engine - no OPF, no GPF, no compromises. Fits G20, G21, G22, G23, G30, G01 and G02 chassis straight out the box.
True catless design: maximises turbo spool and exhaust flow on B46D
One-piece mandrel-bent 304 stainless steel - no joints, no bottlenecks
OEM-fit geometry with factory mounting points and reinforced turbo flange
7-axis CNC bending ensures perfect roundness and smooth internal radii
UK-engineered, bench-tested, and ready to ship
For fast-road or track-day use where emissions compliance isn’t required. Not an OEM replacement - a deliberate upgrade.
