I thought leaky hose so i changed it, same thing. Boost has settled to 8psi through every gear to redline. BTW, I have an 88 TX5 Turbo with full engine rebuild (forgies, resized rods, knife edged crank etc), ported head, standard manifold with r33 s1 gtst turbo (plain bearing) and some other goodies. Still have to get it tuned with the microtech and fuel system upgrades. Shooting for 160kw atw on 14psi.