Tech Performance & Engineering received it's Official California Air Resources Board (CARB) Executive Order Number "D-589", which permits the advertisement, sales and installation in California of the Torque Monster Headers (p/n 9601-50-EX-1) manufactured by Tech Performance & Engineering for the 1996 to 2001 Ford Explorer and Mercury Mountaineer vehicles, equipped with the 5.0 liter V8 Engine. (Quote from CARB letter.) Special thanks to all involved.