The most common exhaust manifold used on the Mini is the standard bore LCB. This manifold with it's two down pieces connect into a 'Y' section that joins them together and leads to the header pipe. This 'Y' section fits at the very bottom of the header is often crushed or bent beyond reason. It's easy to replace and thus save the rest of the header! "Y" Piece for Maniflow LCB C-AEG365 1.75" ID.