You can try to cut them to let the bumper fit, but all you'll end up with is a swiss cheese slice's worth of crash protection.
The best thing to do, and what I did, is to remove the bumper support all together with the 4 bolts holding it on, then order yourself a set of JDM bumper supports. Its the safest and cleanest way to go.
ShowstoppersUSA has JDM supports on order right now, I'm still waiting on mine.
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