T.T.I's vs. ........you be the judge
I agree with Adam and some others, the 1 3/4" headers are lost on a 300 hp engine, totally overkill. While I'm sure the TTI's work just fine on 400+ hp applications, I don't think you'd see them beating out a set of 1 3/4" Hooker Super Comps. Maybe not much of an advantage, but I don't think the article gives the whole story.
Also, there's a big difference between the Hooker Comps and Hooker Super Comps. I'm not sure about A body, but I know that on my challenger the Super Comps are above the steering link, not below like the Comps are. So, at least for an E-body the Hooker Super Comps give just as much ground clearance as the TTI's. I also will admit the Super Comps cost almost as much as the TTI's, but I believe the HSC's have been around longer, making them easier to find used (I picked up a set of 1 3/4" Super Comps for my 340 for $200 at a local swap meet).
Not to say that TTI's aren't really nice, but one article does not make them the end all be all. You still have to match your engine and your headers for best performance...