On 2 Aug 2018 21:40:53 GMT, Paul in Houston TX wrote:

Cast iron went away for most cars a long time ago due to weight savings
needed to comply with gov't mandated fuel mileage requirements.
Take a look at the top pic on the carid.com url. That manifold is cast iron.
Notice how there are no welds. The pipe and the flange is one molded piece

This does seem to have welds, so, it must be steel then, is that right?
http://www.bild.me/bild.php?file=3408929o2sensor13.jpg
http://www.bild.me/bild.php?file=8568761o2sensor14.jpg
http://www.bild.me/bild.php?file=5285317o2sensor15.jpg