Flowmaster introduces their new manifold downpipes for the 1965-1967 Chevrolet Caprice, Bel Air, Impala, and Biscayne with the 396 and 427 Big Block V8 engines. These 2.50" mandrel bent pipes include factory style 3-bolt flanges, donut gaskets and donut sleeves for an easy installation. Constructed in durable 409S stainless steel, the pipes are covered by Flowmaster's Lifetime Limited Warranty.