I put mine in the collectors of my LT's because I had seen quite a few other self tuning peeps have issues with their narrow band O2's cooling too much during idle.
I have seen peeps put bungs for nb's and wb's in a wide range of distance from the exhaust port.
That was the reason I suggested you check with the maker of your choice of wb.
Just a heads up on the header wrapping thing ...........
I've seen some say it causes them to hold moisture thus causing them to have a shorter life span
they are bbk ceramic coated LTs so i dont think i have to worry about the moisture to much i hope, i want to wrap them so there is alot less engine bay heat, and since i have an auto its going to be a very tight fit so less heat on the tranny.
as long as they last 1 year an 3/4. i should be good.
read their instructions it didnt say so I'll give them a call