When a performance product is said to be "street legal," it means that your vehicle will still be able to pass a smog test after the part is installed. Some performance parts are designed for "off-road" uses (e.g. racecars, show cars and vintage cars), and installing them onto normal cars, trucks and SUVs will cause that automobile to fail a smog test. Fortunately, our performance exhaust systems are perfectly legal because they retain your factory-installed catalytic converter. Moreover, our performance headers are all CARB approved, so they too are completely legal and will not disqualify you from passing smog.