Raising the front of the tank provides just enough room to get to both sides. The toughest part of this job is getting to the two inner bolts on each stock plate. Here's some pics along the way for those wondering how this is done. It's really much easier than it sounds.
1. Raise the tank by loosening this bolt, slide the tank back and raise the front. Use an appropriate sized piece of wood to support the tank. The tank wire will prevent it from coming up too far.
2. Remove the hoses on both sides.
3. Remove the valve that the hoses connected to in the triangular area of the frame and seal the electrical connection.
4. Remove the stock covers.
5. Remove these and insert them back the same way they came out.
6. Install a pair of semi_gray's beautiful block off plates with 6mm studs and acorn nuts or 6mm bolts. These will need to be a bit shorter than the stock ones - I found 18mm to be perfect.
7. Remove the hose going back to the air box and block off the air box nipple.
8. These are the removed parts you'll have at the end.
9. Enjoy the sound of your 919 decelerating without the annoying backfires.