[[[[[[[[[ WARNING]]]]]]]]] [[[[[[[[WARNING]]]]]]]]
Please consider what your objective is. This modification will almost double the heat BTU output of this burner. Please be mindful and consider all the factors in your situation to make for a safe camping.

The Camp chef Ranger 2 stove is an awesome stove but it only produces so much heat and 17000 BTU each perhaps enough for most people. We do however stir fry quite a lot when camping. We have several woks varying in size and when stir frying for 4 or more you need heat, and lots of it, to prevent the vegies from boiling, and instead broiling. We usually carries a turkey fryer along for this purpose, but it is bulky and extra to lug around. This is not the first stove I have modified and I believe you can do so while also being safe. I usually work with cast iron burners and this one is aluminum. Being that the melting point is around 2000 deg F for cast iron compared to just under 1300 F for aluminum you have to consider this also when you dive in.
First thing to do is to check for any obstructions. As you can see in the first few pictures there were quite a lot of metal sponge's left inside the burner, so first thing is to clean those out.
This is like rejetting of a carburetor really. You cannot just increase one part without the other. So step one was to increase the burn orifice from 1.2mm to 1.6mm to ensure a higher propane flow. Then the holes in the cast burner was increased from 2mm to 2.7mm. Thirdly the mixing chamber was enlarged so as to be able to suck in more air. These burners are designed to produce a certain range of heat and usually can be pushed a bit but you have to consider the fact that you are playing with fire..... Literally, so please be careful. As you increase pressure and flow through the burner the flame will vary and generally you want to avoid a yellow flame. It is an unclean burn and generally produces Carbon monoxide, so if this was for the inside I would never consider this. It is however for a well ventilated outside stove far away from any heat source, so this can be done in a safe matter.
The end result is awesome and I have now increased the output of the stock burner, even with the trailers regulator, and if I really need to push it, I will grab a tank from the front and use a high pressure regulator.
Please enjoy.