Cast aluminum plenum designed to fit the Weber DGV carburetors. Single or dual snorkel accepts 2-1/2" I.D. hose or any 2-1/2" flanged K&N universal air filter (See Universal pages for filters that will fit). Ideal for cold air applications with remote mounted air filter, the diameter at the carburetor flange is 5-1/8", and the snout sticks out 5" from the center of the adapter. The clearance needed above the carburetor flange is 2-1/2".