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Old 06-20-2009, 06:00 PM   #4 (permalink)
evolutionmovement
EcoModding Apprentice
 
Join Date: Mar 2009
Location: Massachusetts
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The alternatives are much more expensive. Cast iron can take a lot of heat and is cheap to make. Stainless steel is more expensive a material and has to be welded right or it can crack. The rust on the manifold usually takes a while to penetrate. The cast iron sections of the exhaust on my Subaru have outlasted some of the stainless steel, though all of it is original as of this moment.
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