I would rather get a header with design like below, in that vandemon header there is a flaw, all three headers are on single flange plate which could cause leaks in future, my friend built his own headers and it takes separate flanges( same concept as stock headers) , I would rather get separate flange headers than single plate. * just my opinion * Below is photo my friend's TTS supercharged bike custom header.
From seeing Paul's work displayed on this site over the years for the 2.3s I can say that, given his attention to detail, if you can afford it - it will be worth every penny.
The spacing between pipes on the carpenter looks a lot wider, making it looks less streamlined. Overall design is the same but the Vandemon looks neater in my opinion.