Unfortunately, the Ford GT supercharger and intake manifold won't fit a Navigator engine. GTs and the super-rare '00 Cobra R came with unique cylinder head castings. These are the best flowing factory modular cylinder heads ever made. They are also the most expensive. Good luck finding them anywhere, and prepare to take out a second mortgage if you do. To run an engine naturally aspirated with these heads, the only manifold that fits is from an Cobra R, and check out that price!