It was me that did the testing and published in RCJI. The effects of the augmentation principles work equally well on all sizes of our engines running from the Lambert size up to P200 size. The great thing is that the augmentation sucks in a large amount of cool air together with the hot gasses. This cool air runs down the pipe against the wall and keeps it cool. If you are careful and do not have hot starts it is possible to keep a single walled pipe from going any hotter than a straw colour. I did some work on bifurcated pipes and managed to make one that had almost no loss. Most standard straight pipes have a significant measurable loss and bifurcated ones can be much worse.

John