I have a r32 gtr with simple mods. Front mount inter cooler,cat back, and the boost restrictor removed. I don't know how long I've had this problem but I just started noticing it. Basically after I drive the car for a while the car goes back to the same amount of boost that it had before the boost restrictor was removed when I give it full throttle. I simply fix this by turning off the car and turning it back on and i get the extra boost back but it will come back after driving for a while. Why would turning the car off and then on fix it? Is the computer backing the boost back down?