Exit1965...I'm comparing them to Hooker 1 7/8" Competition and the Hooker 5209 2" Super Comps. I had both on 440s and 383s in my '70 cuda and the 2 '69 road runners. Also had a pair of no name 1 7/8" headers that were exact copies of the Hooker 1 7/8" Comp headers.
The Hookers always seem to interfere w/ the steering components. Whether it be the actual steering column or the tie rod ends. One set sat right against the torsion bars.

I used a pair of TTI 2" to 2 1/8" step headers when I put Indy heads on my 440 and they fit GREAT.
Learning from that, when I went to the hemi, I bought TTI's 2.25" primary 4" collector headers and they fit GREAT also.
I have a pair of Hooker 2" primary Super Comps for a hemi hanging up in the shop, but have yet to use them.

Never used Doug's, but heard good things about them.