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Utah Vehicle Safety Inspection Manual:
. Check bumpers to make sure that they meet OEM Specifications in verticalheight, and are centered on the vehicle's centerline. Bumpers must beconnected securely to the vehicle frame, and extend the entire width of thevehicle wheel track.a. REJECT when:1) Bumpers are not 4.5 inches in vertical height.2) Bumpers do not extend to the entire width of original bodywheel track.3) Bumpers are missing, improperly attached, broken, or haveportions protruding which create a hazard.4) Bumpers are not made from a matterial that is strong enoughto effectively transfer impact.
https://highwaypatrol.utah.gov/wp-content/uploads/sites/21/2015/03/2011-2012-SI-PLT-Manual.pdf
I'm not sure what to make of this. It says "OEM Specifications". If I can show that a front bumper was originally an option, maybe I won't have to install one.
Go to a local hot rod show and find out where the guys without bumpers are getting their cars inspected. Sometimes some places will let small stuff slide.
I guess wasn't really worried about whether or not I'll be able to leave the front bumper off; I'm pretty sure I can get away with it. I was more trying to explore the absolute legality of leaving it off, given that it was an "option". Just pure curiosity.