Lol, 33IMP is right. Must have tapped the disagree button when scrolling by.
For the record, I'm a header guy; I have never had manifolds on my car. I was starting from scratch with nothing, so I wasn't about to go looking for manifolds when I could go looking for headers instead.
In the late 90s I started with the same cheap headers you have on your truck, then I went to the shorties that were tested in the magazine article that was posted earlier in this thread, and for the last 10 years or so I've been running coated Doug's D453 headers.