Installed the headers this past weekend. I got the OE manifold off without taking the intake off. However, my plan to sneak the 6-1 header up from the bottom failed when I realized just how bulky it is and how I'd need the car on a lift to even begin to try to squish it up there. So, I took off the intake. I pulled the rail and injectors to the side, and noticed that the two black top injectors are completely different style injectors. Maybe off of a 280ZX or something. Knowing the other PO tricks, they are probably a different size. Ugh, no wonder it gets shitty mileage. Seems easy enough to fix later though.
Since the 6-1 headers didn't have an EGR port, I had to modify the intake a bit
Some of the intake bolts were loose; someone's been here before. Also, some didn't have washers either. I found it amusing the way Nissan has only top bolts holding the intake on but just studs and washers pressing against the bottoms.
I've ordered a mild steel 3" builder's kit, 24" "resonator", and a stainless 14" muffler. Couldn't find any decent tips online so I will hold off and check the local shops when it's all together. The 6-1 has a 2.5" exit, I've ordered a 2.5" to 3" transition. I'm making it 3" from header back because I plan on being able to swap from VG30ET to L28 more-or-less easily, and I don't want to have to make and then swap the entire exhaust system.
I'll take photos when I start building the exhaust.
It's loud as **** with open headers. I miss my turbo engines.