TS includes a alum plug that just goes into the recirculation tube i believe. Better to find a cap that fits on the intake tube and remove the tube completely.
Yes, you will get a p0035 code. If you have a tuner, like your sig says, you can have tuner just turn it off in tune and dont need to splice. The wires, you need to cover up with a bag and zip ties.
The whole black cap turns to make tighter or looser on the BOV. Looser will open easier.