There's a resonator behind the left headlight that I've removed in this pic:
In the bottom, there's a 1 1/2" test plug with a hose clamp sealing the hole.
There's another box coming off the intake hose that you seal with another test plug:
Better view of the tube:
2" is the normal recommendation, but the one I used split the tube. Wound up with a 1 1/2" threaded pvc plug in there.
The 3rd one is a large baffle under the left fender. Remove the screws holding the liner below, then reach up and yank it out. Will take some time, and probably some scrapes, but could just fall out. No plug needed for this one.