Itís not always legal to modify certain parts of your car. For instance, federal law says you canít remove or replace your catalytic converter if it is in working order. Also, some of the parts we sell are not legal for street use in some states, like California. Items that have a CARB (California Air Research Board) exemption number are legal for street use in all fifty states. Some parts are only legal for track use, and are not legal for street use in any state.
One last thing: Please drive safely
Obey all traffic laws. Test the limits of your car only on a race track or drag strip, not on the street. Drive safely and responsibly to protect yourself and others.