blykins, if the cores he used are the same ones that I had fabbed, they run about $160 each, plus shipping. You would then be on your own to have a local welder do the cuts and welds to "section" them in place of the factory glass (steel wool) packs.
I have a call in to my fab guy now. Once he confirms when he'll be back in his shop, then my pipes come off and I get him to work.
Here's a link to my original thread (hope it works). It has pics of the cores.
http://www.clubcobra.com/forums/show...123#post566123