I just did an injector change and did a TON of research on it. Just remember if you only change the one that is bad, that cylinder will be working different than the rest. They will not be working in unison, they are not worn the same. I got a set of stage 2 injectors from Jim at Rosewood Diesel Shop. He is a great guy and answered ALL my questions for about a month before actually purchasing them. He has budget builds that will save you a lot of money. Check him out and good luck.