Didn't know about them wanting to have the 225, 240 and 275 horsepower engines. The 240 was probably just a cam change. Glad that they didn't do the Commando and the Commando HP.
Just went out and measured the original D/Dart headers. They are 1.75 OD and the collectors are 3". The current ones that Doug's produces are 1 5/8 with a 2 1/2" collector. Might make it easier to mass produce. I think it took me about 30 minutes to put the headers in -- by myself. With all those pieces, it was easy. The original owner of my other D/Dart said he took them off because he was tired of hearing the exhaust leaks.
Alan