Uhm - I would like to see what all that includes, because I cant even imagine anything short of cast iron manifolds weighing that much.
104lbs?
Something doesnt seem right at all.
Most factory exhaust systhem are notorious for their heavy weight
Example of titanium exhaust systhem for a mitsubish evo exhaust systhems made from titanuim are lightweight and strong http://www.stikiller.com/product.php?productid=16725