I chose to open the left side of airbox and use K1200S parts to complete it. Initial cost was reduced over the EVO kit, but will be made up later with air filter replacement costs.
I chose this route because I wanted to use OEM filters and wanted to just do it myself
Parts needed for my 2006 K1200R installation:
13717703583 Air Filter element (qty 1) $19.50
13717675519 inlet manifold left (qty 1) $92.00 (part number is for left side K1200S)
13717672549 latch striker (qty 2) $2.00 each.
Step 1, prepare the new S inlet manifold to fit the KR. I did not take a pre-cut photo, but this is close, just minus a blade width. I used the blue painters tape which is 3/4 inch to get a straight line and as a guide to cut on.
I put the tape along the bottom, and cut it with a saws-all, this was the final result.
Here was a simple fit check, and to see how the filter fit into the base.
Step 2 was to remove all the front bodywork.
Step 3 Disconnect your battery
Step 4 was to remove the right side air filter.
...Through the now open right side, I used a set of bilge fingers (not sure what they are really called, but they look like this)
I used that tool to place a lint free rag on top of all the velocity stacks to keep debris out.
Step 5 was to open the airbox.
... I was all set with a heat knife, but I found it did not work well for me. It melted the plastic, but was hard to control and was leaving an uneven (melted) edge. I wound up using the heat knift to just score the plastic and used a dremel tool to make the final cut through the plastic. Here is an image before I cleaned up the edges.
The lint free rag helped to keep things out of the velocity stacks, but there was still a little bit of debris in the airbox. It settled down to the front of the airbox. I tried using another lint free rag to get it out, and that was hard to do. The easiest was just using my fingers. Slide them around the front bottom of the airbox and the debris will stick to your fingers coming out easily.
Step 6 install the new unit along with the retaining clips
Step 7 re-install the bodywork
Step 8 connect the battery and preform a TPS calibration
(key on, throttle end stop to end stop 3 times, key off)
Step 9 go for a ride and enjoy.