What is your procedure to calibrate the boost gauge and which gauge do you own ? I calibrated with engine shut off.
Although the engine will not see the boost spikes while you shift - in case the throttle is closed causing the spike - they seem to be quite high. Using a flash, I currently never spike above 16.5 PSI while shifting ( it's cold here outside, winter season ). Do you see +20 PSI spikes on the gauge as well, by recalling maximum boost ?
p.s. does not look like you have a boost leak, IMO.
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