The car is a 94' 6-speed, and the only mod is a 3" catless downpipe. In sequential I will get about 10 psi out of the first turbo (give or take depending on gear/load) and then the second will prespool when it is supposed to, come online when it is supposed to, and peak to about 12/13psi depending on the gear and load. However, I tried temp TTC with the checkvalves, and if I floor it in third gear at about 3k rpms, the boost will slowly rise, and when it peaks it will shoot WAY higher than it does in sequential (about 16 or 17+ psi) and then shoot right back down to 12/13psi instantly. Does this sound like I have a sequential problem or is that normal? But even if I went permanent TTC I dont think it would be good to be spiking to 17 psi all the time with just a Dp installed and no BC even. What are your guys' thoughts? Any help is appreciated, thanks in advance.