Hey, so it even had stock exhaust? thats a good time, im sure the 7+ grand launches help but i dont believe it gained 22AWKW by removing the boost restrictor. and its not really stock anymore because it runs an extra ~2psi boost..
I would believe it if it had an aftermarket exhaust. i say this because a friend of mine has a dead stock r33 gtr, (motor is in good condition) and just for an experiement about 2 months ago we removed the boost restrictor, took it for a drive and it seemed to come onto full boost harder, but not much of a power gain overall. so we suck it back in, and put the lack of extra power down to the stock exhaust being a restriction.
on another friends gtr, when it only had a full exhaust, it made a big difference when the boost restrictor was removed.