RRR ... The original Dougs that were manufactured for the D/Dart had 1 3/4" primary tubes and 3.0" collectors. I do have a set of both. I measured the ones that I have from the late 1990's and the primaries are a little under 1 5/8" and the collectors are 2.5".
The originals took me less then 2 hours to install on my first D/Dart (The *****). Yesterday, I started reinstalling the late 1990's set of Doug's headers on my D/Dart, Dana's old car. I had to go to a 10 1/2" clutch setup due to the installation of a Mopar Performance 360-380 HP crate engine. I know it'll take more then 2 hours to install them.
