Just saw this and wanted to chime in and say that PR has started using injector clips. Robert from PR gave me some info a month or so ago, I've summarized it for you:
- The inserts now self tap into the manifold for a consistent install.
- All kits have been shipping with clips for injectors for a while now too. This removes 72.5 psi of the 100-110psi of force the rail sees, and if the rail ever did come off by some magic with the new inserts, the injectors would stay locked in, keeping the fuel contained thanks to the injector clips.
If you'd like the injector clips and don't have them, I'm sure you can reach out to them and they'll take care of you. I'd recommend PR MPI/fueling over anyone else any day.