21 psi, I also forgot tot mention that it has a water/methanol spray system which i believe operates at WOT. I turned it on this morning and it seemed to run heaps better, coincidence? It progressively got worse as engine bay got hotter. Hot day hear in Kal today. Possibly ran out of water have not checked this yet. One more thing I noticed check engine light and I think warning light on turbo gauge (greddy) coming on but turning off at lower revs. Crazy!