Stamped tank is made from a top and bottom stamping and then zipper welded together just like a factory tank is as opposed to completely fabricated from flat stock like your stainless tank is.
Labor and materials are much less when making it this way, so cost is much less.
FWIW, I believe tanks is stamping Aeromotives tanks. Ricks looks like they have their own tooling. There are pros to each one, the Tanks corners are clipped quite a bit more but it looks like the pick up has better baffling.
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Donny
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