Are you talking about the diffuser for the airbox? If so thats easy, The AIS is the worst part. Get block off plates and get rid of it.The plastic piece below the airbox and above the AIS/ Spark plugs is a severe pita so pay attn when it comes out to how to reinstall it
This. I changed the plugs on a Buddy's 05 about two months ago through the air box, super simple WITH THE RIGHT TOOLS.i can't see draining coolant and re-filling just to replace the plugs... the airbox route takes maybe an hour tops and you dont have to fcuk with fluids.
unless you i needed to change the coolant anyways theres no way i'd go through that.