I had OBX stainless headers on my old Silverado SS and they were awesome quality and were the easiest headers I've ever installed. Quality was very good. Never rusted, so they aren't using the lower quality stainless at least.
I have the OBX header for my Focus now but just haven't installed it. It looks to be just as good of quality as the ones I had on my Silverado. I looked at the cat back OBX exhaust but ended up going with the MS3 stock cat back exhaust at least for now. Now I just have to get them put on!
2013 SE Hatch - 5 spd, Spectre filter, no lid, Unleashed E85 tune
1976 GMC C15 Sierra Classic - 454, AC, 2WD, LWB, 1.75" headers, .501/.510 232 cam