Which FX power plenum kit for 1st Gen Impact

I could be completely wrong, but I thought I read (when they came out) that the MKI rifle would have to be upgraded to some MKII parts in order for the PP kit to work. Hopefully someone can confirm if I am completely wrong or not. I usually try not to respond to posts when I don't know, but I wanted to throw that out there to make sure you research and get the proper answer before spending your money. 
 
Here is my impact x with it on

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