Do you just remove the whole piece? Or do you break off the bottom and leave the top on?

 

I do not molest or remove...

 

I couldn't get the 1680s to fit with the diffusers in place.

 

Ah, does 3rd gen have 1 piece diffusers? (another 3rd gen cheap out?) Been a while since I was researching this.

I fun an unmolested S4 bottom diffuser in my S5 TII LIM w/ Bosch 1600s.

Let me look at the inj, seats- I remember something..

-edit- ah, I see. You must trim the "flange" off the yellow pintle cap so the "O" ring seats on the difusser top well.