Dont know if this is relevent but I will add anyway.I have some old side feeds from a EJ22 (red ones) and while messing about with this and that, I decided to pull apart the injector. I removed the plastic cap and underneath was a thin metal plate with 3 or 4 holes in it, I then grabbed my side cutters and literally peeled off the plate and was left with a single hole.
If this is what decapping is then $400.00 dollars is a bit much.