Who makes at least 2" or bigger 440 headers for a 72-79 D-100? Does not have power steering. Anyone know.

I have been searching high and low for years. My mud bogging truck ended up with them sticking out the hood, which was then banned for my class.

The only one I have found is from mad dog headers.

http://maddogheaders.net/products/mopar

they are fenderwell exist though. I have heard stories of B-Body headers I think, but never any definitive yes/no.

Maddog Headers makes a 2" primary w 3.5" collector for the 4X4 truck, but they also make the same size for an A-Body chassis (#7601) and I am told you can fit them in a 2WD D100

Certainly a good place to start. Good Luck

See the photo of the A-body header.

I had 2" b-e body hooker super comps on my truck. They put 2 tubes out side the frame rail on the drivers side. Had to notch the inner fender some and notch the upper frame rail about 3/8" for one tube.