The Stovebolt Site Forums The Shop Area Engine Shop split exhaust manifold with a COE intake setup

There's a picture of a dual COE manifold here:

http://www.inliners.org/Advertisers/kkk_ad2.html

My understanding is that this service is no longer available so you'll have to do it yourself. Call around locally and check availability for a 2" heavy wall(schedule 80)carbon steel long radius 90 degree buttweld elbow like on this page:

http://www.hybvalve.com/pipe_fittings_elbow.html

Then shape it with no gaps according to your own design.