Look at my writeup on installing headers.
You don't need any RTV. I do nothing special to install headers and never have a leak from not using RTV.
You don't need exhaust gaskets, the stock ones are mls and a quick wipe is all I've ever done to them. Again, never leaked.
Move the firewall where I've instructed as the O2 on those two sets typically is in a bad locaton. Then work with the straight piece of pipe they give you to put the cat in the middle of it. Which likely means you need 2 additional 3" clamps.
So I suggest either summit or Frozen Boost for the clamps. FB is typically the better cost.
2 2.25" band clamps
4 3.00" band clamps
1 can brake cleaner on hand for the gaskets
1 rag
Jack
18mm socket
13mm socket
Ratchet
15mm socket
That's about all you should need. Maybe some tools for the removal if things fight.
