Heat soak will be the obvious issue with these. They will sound more aggressive, but will most likely cause you to lose power. Since you're so opposed to removing the front bumper, I would recommend dropping in a set of K&N filters in your stock air boxes and then wrapping them (the boxes) in heat shield.
Just my $0.02
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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