273 Commando Manifolds

It seems everyone has an idea on what the HP exhaust was or wasn't for the Commando 273 but unless they actually had a car with the HP single exhaust, it's all a lot of speculation. These guys - http://www.accurateltd.com/A-Body-HiPo-Exhaust-System_p_195.html seem to have it down as "accurately" as anyone IMHO and if I ever restore my 67 back to original, I will be giving them a call.