273ci thoughts?

Use the Commando 2.5 inch single exhaust with straight through muffler and resonator. Uses stock exhaust manifolds. See Accurate Exhaust, A-Body HiPo Exhaust System, or Waldron Exhaust, 1965-67 Barracuda w/273ci 4bbl carb in Stainless Steel [7760740202] - $713.00 : Zen Cart!, The Art of E-commerce. Pricey but you get the idea.