headers
I don't know about TTI's being the only game in town for A-bodies. The only advantage they have is not wrapping under the center link of the steering, seems folks have as many other clearance issues with them as with other brands.
I am using Hedman's and for less than half the cost with ceramic coating or 1/5th the cost painted they fit with no issues in my Barracuda. They have been installed with manual and with power steering and they clear everything and I have not had any leak issues in 15k miles since installing them. The wrapping under the center link has only been an issue if I pull into my garage to quickly, large lip from the pavement to the concrete of the garage.