No it shouldn't have any effect, most people remove it anyway. Kicker with warranties is the dealer has to prove that the mod actually caused the damage, removing the air dam does nothing structurally for the vehicle it's merely aesthetic. As far as I am aware, rip it on off.
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JKUR Rock Krawler 3.5", Fox 2.0 shocks, RK High Steer/Drag link flip, 37x13.5/20 & 5.13's and a whole bunch of other stuff