Flowmaster introduces their manifold downpipes for 1967-1968 Pontiac Firebirds (incl. Trans Am) with 350/400 V8 engines. These 2.50" mandrel bent 409S stainless steel pipes only fit with manifold castings 9777755-D/S and 97794320-P/S and include the factory 2-bolt flanges. These downpipes are manufactured in the USA and are covered by Flowmaster's Lifetime Limited Warranty.