I pulled the restrict or out, and got it tuned, the tuner said it was ok, it showed no boost spike on the dyno
Drove the car at night, suddenly get boost spike every time I put my foot down, it started pingining (allot)
Then again, my mate did the same thing in his 33gtr, it's been running fine for two years, using factory ecu (then again he doe sent really drive it hard)
I suggest using a proper boost controller