Flowmaster introduces their manifold downpipes for 1967 - 1972 GM C10/C15 1/2 ton 2WD pickups with small block V8 engines. These 2.50 in. mandrel bent 409S stainless steel downpipes fit only the factory Angled Ram-Horn manifolds and include 3 bolt flanges, donut gaskets and donut sleeves. These downpipes are covered by Flowmaster's Lifetime Limited Warranty. These pipes can be used with systems part number 17654 and part number 817654 for a complete engine back installation.