have any of you guys ever added an egr valve to an engine and intake that was never designed for one and if you did how did you do it ? pictures would be great. i am having trouble with knock counts being high like 3900 counts in a 25 minute drive home from work . the closer i get to the 128 blm the more knock counts i get. if i have my blm at 120 or less i dont seem to get any knock retard . if i can add an egr i would get less knock and be able to get a little better miles per gallon. will probably run a little cooler especially when towing.