An aluminum charge pipe for second-generation B58 engines. The charge pipe carries compressed air from the turbocharger outlet to the throttle body. BMW moulds the factory piece from plastic, and on the B58 it is the part that gives up first once boost pressure goes above stock — usually by splitting, or by letting go at the coupler, under full throttle in a high gear.
Replacing it with a mandrel-bent aluminum tube and properly clamped couplers removes that failure point. It is not a power part on its own: flow through the factory pipe is perfectly adequate at stock boost. What it buys is the ability to run a tune without wondering whether the pipe will survive it, which is why it is worth fitting before the tune rather than after.
This is a Gen 2 part. No tune is required to fit it, no emissions equipment is affected, and it ships to all 50 states.