Rugs
I'm doing the same thing with Cyba's quad diffuser just like yours. I have not installed mine yet as I am waiting on the quad tips from RennArt. I would be interested in seeing your cut out prior to installing the diffuser and how you handle the lower bumper supports. I will post pictures of mine if I get it done first for you, but one of us will be first and it could be helpful to the other.
Peace/out
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Fubarsky
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