Somewhat in the middle of the two in terms of difficulty but I didn't remove the fog light. You have to remove the stock air box and part of the sound generating tubing (with the new intake this is not needed, its loud enough)
Before and After:
Here's a video that goes into detail about it
[ame="https://www.youtube.com/watch?v=7I_gS_bIQn0"]Injen Intake System - Unboxing, Install and Review - 2013 Subaru BRZ - YouTube[/ame]