Answer
Oct 28, 2025 - 03:30 PM
CARB EO# D-721-4 means the Sinister Diesel Blue Spring Kit with Adj. Billet Spring Housing and Fuel Filter Cap for 2003-2007 has received an Executive Order from the California Air Resources Board (CARB), confirming it is legal for use in California and other emissions-regulated states. CARB compliance ensures this kit maintains emissions standards, keeping your vehicle environmentally responsible and street-legal.
