Cody has it right. When an ECU is first reset, any learning and adjustments happen much quicker. Once the ECU "settles in" it takes a very large change and a lot of time for it to make any further adjustments. When adding just about any parts, a reset is recomended.
While an intake leak will cause a/f inconsistancies, it is not likely to cause boost fluctuation.
Thanks
-- Ed
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