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I had a JDM S13 with the original SR that came in it from the factory, and I was getting 11 lbs of boost. Most people that do SR swaps don't install the factory boost solenoid because it's mounted on the shock tower, and since they buy a motor and not a clip, they don't get the boost solenoid. Also, as reeskm said, there was a factory restrictor in one of the lines. It is usually found in the line that goes from the boost solenoid to where it's tee'd off. It can be easily located by looking for a white band towards the end of the vacuum line. Removing this line and replacing it with a normal vacuum line gets you 11 lbs. The car will only boost 7 lbs if the wastegate is connected directly (which is not the way it comes from the factory) since the spring is set for 7 lbs.
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