Get some NEW RV 275 sticks. That and the EZ and boost elbow run clean and better mpg.
My friend's had that combo for at least 15 yrs now and near 200K.

 

It is my understanding that the DDP stage1 injectors are comparable to RV275's. I just put these new injectors in last year. I already have the EZ and boost elbow. What level is your friend running the EZ on?

 

He leaves the box on #3. The RV275's are I believe 40 hp.

 

I have always left my Edge EZ box on #3 with the DDP1 injectors (50hp). Today I drove the truck to work on setting #2. The truck still had great power, but not as much smoke when accelerating onto the freeway. I think I might just leave it on #2.