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It appears that Nationally full 'On-Air' airbags x 4 are completely acceptable as long as within replacement manufacture specs/certified AS compliance supply & must be within 2/3rds of the stock cars travel before full engineering is required.
State laws by State laws do also appear to differ significantly, our shared beaut High Country Nanny State does appear to require certain idiot proof safety additions such as automatic startup preset ride heights, low pressure alarms and specific visual positions of gauges within driving line of site.