What is the 'mandrel bent'?
mandrel bent means that the inside diameter of the pipe doesn't change opposed to crush bent were the pipe is crimped, causing the inside diameter to be smaller in the bends.
here is a pic of a mandrel bent pipe:

here is a cool link that talks about the differences between crush bends and mandrel bends:
http://www.se-r.net/header_exhaust/m...rush_bends.htm
good luck,
aj

here is a cool link that talks about the differences between crush bends and mandrel bends:
http://www.se-r.net/header_exhaust/m...rush_bends.htm
good luck,
aj
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