All fabricators know that more often than not the most time-consuming aspect of fabricating a turbo manifold is making the merge collector!The Aeroflow Performance turbomerge collector range will save you hours of labor when fabricating a manifold and no more wasting material trying to figure out optimal angles. These cast 304 stainless steelmerge collectors are a crucialpoint when it comes to an evenflowing exhaust manifold. Eachmerge collector is cast meaning no welds can potentially crack over time. Available in either 6 into 1 or 4 into 1 configuration withmultiple flange options to choose from.