3. This product is not legal for street use on an emissions-controlled vehicle. It may be used on dedicated competition or pre-pollution-controlled vehicles only.

All product with this icon are designated for Racing Use Only and can never be used on pollution-controlled vehicles both on or off road. They are acceptable for dedicated racing vehicles and vehicles that pre-date modern emissions controls. Pre-pollution controlled vehicles are defined as 1965 and older domestic vehicles and 1968 and older import vehicles in California.

More information: https://www.pypesexhaust.com/voluntary-labeling-program