Good quality injectors are being harder to come by. I found these on E-Bay
That seem to be of very good quality, packed well also. Been running for
more than three years with no problems.
Idles smooth
Better performance over all, than others (new)
Idle is 50-60% quieter, Can now order fast foods from outside With Out
shutting off engine!
No down side that I can see.
This is the size I chose ND dn12 sd290,still very pleased.