Forty years ago Pierce Manifolds Inc. built its first manifold for installing a Weber DGV carburetor the MGB... Fast forward Pierce Manifolds Inc today has the largest Weber carburetor/ Weber carburetor parts in the world. Pierce Manifolds Inc is also the world's largest manufacturer of intake manifolds for Weber carburetors. PMI also offers restoration on vintage weber carburetors. We have restored over 7000 Webers to date.