An Excellent upgrade for anyone that has previously removed the factory header or has a high performance header. The MINI's factory header bolts are designed to be used one time only. After removal the small locking ridges on the factory bolts get worn off and loose 50% of their gripping capability. In our facility we routinely find at lease one loose factory header bolt that has come loose over time if it has been re-used. This prompted us to find a permanent solution to the problem. Our Locking header bolts are designed to last the life of the vehicle and are good for unlimited installs. Once secured properly the will never back out even under the harshest racing conditions! For use with any header system. The bolts can be installed without removing the header system and generally takes 20-30 minutes to install.