I wasn't too happy with my power, but I guess I never will be. But on the second run I had him flip the switch to the HHO and amazingly I got an increase. Now there also is a noticeable difference in the a/f ratio. But he said that since I have a dual exit muffler, it would read a tad lean. On the Dyno it was upper 13's w/ HHO to low 14's w/o HHO. On my gauge it was 13.0-13.3 w/o HHO and 12.8-13.2 w/ HHO. Here is a pic
Here is the video. My truck is allot louder than I thought. YouTube - 4.8 pre-cam dyno news I guess. I need a retune fo-sho