I used to have a G3. No you do not "need" the gate valve mod. I found it very easy to adjust with the standpipe. With the gate valve you wont have to get your hands wet though....other then that I say its not worth it.
The meshmod might be something to look into. I did it to my G3 and it really helped performance. I also drilled out the air hole in the venturi as well.
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