I have just recently started getting my car back out. It sat for a good while with being busy with work and stuff around my house. Decided a few weeks ago to see why the motor was having issues. Well once the valve cover was taken off it became quite apparent what the issue was when it came to the motor stuttering. Have had these on for around 6000 miles. It just snapped it into with no other damage and was so thankful that was just it. These are the revised ones and heard of metal fragments, but was not expecting this! LOL