Inserting baffle into yoshi pipe

Im interested in this CF yoshi pipe, however im a little confused on how you would secure the baffle into the muffler.

Correct Baffle???

Instructions

Do you secure the baffle by securing the hex screw from the inside of the pipe or would you have to drill a hole from the outside of the muffler in order to align and secure it with the hex screw.

Correct Baffle???

Instructions
Do you secure the baffle by securing the hex screw from the inside of the pipe or would you have to drill a hole from the outside of the muffler in order to align and secure it with the hex screw.