Through the years the soft rubber bushings deteriorate after constant flexing and vibration as well as being punished through weathering; this can cause them to tear and may seriously damage your engine and transmission mounts. Megan Racing has developed an aluminum engine stopper for Subaru EJ engines.These reinforced stoppers are perfect for the enthusiast who is looking to get the most from their vehicle as they will allow more energy to be transferred to the wheels instead of absorbing the energy into the soft rubber.