Well, there is no doubt that the JCI headers have much better clearance in regards to plugs & wires, but most have gone with the larger diameter JTR headers for increased performance. So, I guess it comes down to what sacrifice you want to make.....fit & finish vs added horsepower. Shouldn't need to "sacrifice" with the JTR setup, but I guess that's the way it is. As long as the plug wires didn't hit, I could live with having to pull the headers to change plugs since it'll only need to be done every decade or so.