66 Barracuda options ?

I'm no expert, but an engineer from Chrysler who is in a local car club says the way the hypo exhaust system was designed, the 273 commando will perform better than with dual exhaust. Not trying to get an argument started, just repeating what an expert said. He was with Chrysler when the hypo was designed. Any thoughts. I am replacing the dual's on mine with the hypo system once I finish the complete restoration.