Tein put together a video recently that compares imitation springs to their springs by testing them. During the durability test, watch as the imitation spring fails, and fails badly. Not only does buying imitation parts pose a safety risk, but by buying parts that are not genuine, less money goes to the R&D of new products. Over time, this can put reputable parts manufacturers out of business. If you want to continue to see the best performance parts made for you vehicle, support the companies making them by buying their products. And more importantly, don’t buy the imitation parts because of the safety risks to you and others on the road around you.