Is a Snorkel Legal in the US?
A snorkel is legal to fit in the US. The catch is emissions paperwork in CARB states: a snorkel that feeds the factory airbox is generally fine, but one installed as part of a replacement intake system needs a CARB exemption in California.
Why?
Mechanically, a snorkel just relocates the engine's air pickup up the A-pillar for water crossings and dusty trails, and no state prohibits that. Mounted properly it sits outside the driver's sightline; it must not intrude into the swept area of the windshield or block the view.
The legal nuance is emissions. In California and other CARB states, replacing emissions-related intake components is tampering unless the part carries a CARB Executive Order exemption. A snorkel that connects to the unmodified factory airbox generally passes smog checks, but a snorkel fitted together with an aftermarket intake that deletes the stock airbox inherits that intake's need for an EO number.
The rest is installation quality: the drilled body openings sealed against water and exhaust fumes, the tube secured so it cannot come loose at speed. Done that way, a snorkel is street-legal in all 50 states.
What decides if it's legal
- A snorkel feeding the factory airbox is generally fine, including for smog checks.
- Replacing the airbox or intake system needs a CARB EO number in California and CARB states.
- The snorkel must not obstruct the driver's view or wiper sweep.
- It must be securely mounted with body openings properly sealed.
Does it depend on your state?
In non-CARB states a snorkel is a non-event. In California and CARB states, keep the factory airbox or make sure any replacement intake it feeds has a CARB EO number, or the smog check visual inspection can fail the car.
Related legality guides
Sources
- Statutes, regulations, authorities and FMVSS (NHTSA)
- Aftermarket, performance and add-on parts (California Air Resources Board)
Sources last reviewed July 2026.
This page is general guidance, not legal advice, on the rules in the US for snorkel. The detail varies by exact vehicle and changes over time - confirm with your insurer and the EPA, NHTSA and your state DMV before modifying.