TRE makes a good paperweight in my opinion.
As for the speedo healer, I have the same opinion, a lot of things change as your tire wears , I just take 10MPH off mentally when going up to 100MPH, anything above that I am going to jail anyway.
Gear indicator would be nice, nothing like finding 7th gear whilst you're in a hurry.
PC111 USB is worthwhile, but finding a good dyno shop is a pain.
Some will tell you to remove the secondary butterflies ,but if you are going to do it, remove the shaft as that is the thickest profile part of the system.
My emmisions block offs have cured a lot of the back fires, not all, but if you are going to a full system and having it dynoed then they need to be blocked off anyway.
Not much gain if any by putting short velocity stacks on so I wouldnt bother .