RE: .28 in a funfactor? oh dear....
Antwar made that manifold by using a Savage header and the CEN header cut and spliced together. I you don't want to do that here are some links for the TC3 ones,
http://www.ofna.com/pipes-10.html
http://www.dynamiterc.com/Products/D...ProdID=DYN6626
http://www.dynamiterc.com/Products/D...ProdID=DYN6624
rolland