I have a PHP Hydra that I experienced problems with when in the 65hp tow setting. I have a couple of post here about this. I just got off the phone with Shawn at PHP and what we decided on was for me to try towing tune from someone else, that's the nice thing about the Hydra Chip, I can up load a tune from other writers. I was thinking of Gearhead or someone else. Does anyone have a suggestion on a good tune writer.