What is the fine-grained topic of the following text: Advantage Racing Products branched out into the cut-throat 1/8 Buggy Tire industry…they participated in the testing and design of DLD tires (France), and imported the tires and closed cell foams to the United States. Only return the topic.
Advantage Racing Products' involvement in the 1/8 Buggy Tire industry and import of DLD tires and closed cell foams to the U.S.