The following symbols, acronyms, and abbreviations apply to this part:

$   U.S. dollars.

CFR   Code of Federal Regulations.

disp   engine displacement.

EPA   Environmental Protection Agency.

kW   kilowatt.

L/cyl   liters per cylinder.

NARA   National Archives and Records Administration.

NOX   Oxides of nitrogen.

SAE   Society of Automotive Engineers.

SEA   selective enforcement audit.

U.S.   United States.

U.S.C.   United States Code.