I'm confused. Are you concerned that the S/C isn't creating the advertised boost or that it's not generating the advertised power or is it suddenly making less power and or boost than previously measured?
Boost values are all based on the capacity of the blower. the size of the pulley, and the engine (including intake, exhaust, IC plumbing, and valve timing) -- if you have something set up differently than Stillen had when they took those measures, you will get different results.
As to power, unless you are finding evidence of a loss as compared to an earlier run on the same dyno, I would guess that tuning bugbears aside, your car is putting down power and torque figures in line with expectations.
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