Gumby - I tried to order the non-megaphone power box, but SP Tadao said they were out of stock (as was Webike, etc.) and they didn't anticipate being able to resume production for 3 or more months. I do like the very clean look of that diminutive pipe.
Brougham - The stock ECU will handle most any slip-on. It's not until you eliminate the cat converter that a separate fuel controller is needed.
I mentioned the SP Tadao sounds like the Staintune. It does while riding, but when goosing the throttle in neutral it has a slight tinny sound component when compared to the Staintune. It's not bad, just different.
On another subject I got a wild hair up my a$$ and decided to paint the grab rails, mostly for the sake of change. I used gloss black but will change it to matte. I can't decide if I like it and can always go back to silver.