I did contact 5star, and they initially changed things on my 87 daily driver tow tune to see if it helped matters. I confirmed after almost 2 weeks of driving including a couple of mountain passes, that I did not experience the turbo flutter anymore. I then contacted them back and asked them to go ahead and change the other three tunes that they did for me, and so far everything seems to be pretty good. I'm happy to give anyone my information if you want it, so you can refer to my situation when working with 5star. They seem to be pretty knowledgeable about what might cause the turbo surge, I would hope they could fix this pretty easily for other folks.