injector, AAC, and air regulator clips for over 5 years with no problems. I did leave them on other items including the CAS and TPS. But removing and re-installing those injector clips and other hard to reach places was a pita and added about 20 minutes to a plenum pull so on a whim I left them off after one to see what happened. Five years later still going strong.
Every once in a blue moon my car might start idling a little wacky and I discovered that was caused by the AAC connector getting slightly loose. Press it back down and it's good to go for another countless months. I still have all the clips in a bag in the event I need them.
