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It appears you are pulling air through them but I can't see the head flange to see if you used a radius entry into them, which would most definitely affect the flow into the manifold tube. Regarding your theory of comparing the restriction of the turbine to the manifolds:
Don't get lost in comparing the CFM numbers measured at a standard dP. This is similar to thinking because your manifolds only flow 200 SCFM, there is no sense in having an exhaust port that flows higher. Ultimately, the Holy Grail that everyone is after is a reduction of exhaust gas pressure in the cylinder via a reduction of restriction (friction) downstream. If your manifolds flow better than stock, they most certainly expose the turbine and every other exhaust component downsteam to a higher pressure, resulting in higher total mass flow through the system (just like if you tested your manifolds at 36" H2O instead of 28"). Conversely, on the other side of the turbine, if the cat-back has less restriction than stock, the dP of the system is reduced or a higher total mass flow through the system will occur. Basically, be it a reduction of friction upstream or downstream from the component of interest, the total mass flow rate will increase - comparing a standardized individual flow rate of one component to another will always be masked by the system as a whole.
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