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Old 10-04-2012, 04:34 PM   #11
TerraPhantm
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Join Date: Feb 2008
Location: Mountain Top
Posts: 5,977
My Ride: 2005 M3 Coupe
Quote:
Originally Posted by joegr View Post
Plastic is cheaper in quantity, but there's another reason too. You can make plastic parts in shapes and complexities that just aren't practical for metal.
Nonetheless, it seems a bit counterintuitive to make something that is required to withstand high pressures for years out of plastic. I think the fact that mishimoto managed to make an aluminum radiator/expansion tank combination is proof that there were alternative options
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