I was wondering how this EGR cleaning garbage actually did anything at all...
The only way for this to have ANY sort of positive effect, at all, in my opinion, is you'd have to feed it into the rear of the cooler, or the up pipe before the cooler exhaust inlet, running it through the cooler, and EGR inlet and outlet and valve itself...but the time required to set all this up, or PERMANENT modifications necessary to the truck to make it happen, in my opinion, would be more cost/time prohibitive than pulling the intake and having it cleaned properly, as Keith suggested.