pressurize to find leaks

[hookliftpete]

Maybe an ignorant question, but to put pressure on the entire engine, intake, cac, turbo, etc, wouldn't the exhaust need to be plugged as well? In another thread, it was only mentioned that the intake and doser pipe (don't have one on mine) need to be plugged to put pressure on the whole plant.

Thanks!

Planning to get one of these asap https://amzn.to/2KR7lPM
as suggested by the man himself.