This is just me, but in my opionion, you only need two kinds of caps. Ones with two nipples, and ones with one. The routing of factory turbo returns sucks, and no matter what truck I am building, or re-working, I route all my hoses the same way. Start and #7 with a dead end cap, and work forward, T-in the filter header between #1 and #3, then from number 1, cross over the IP mounting flange to #2, then work back to #8 and go to the return manifold. The IP has a direct return to the manifold in the back. I never lay a hose on the valley pan, and I never put a hose or a clamp where I can't see it easily. Trust me on this. It's the way you want to go.