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It's not simple volume in equals volume out.
The flow restriction changes mass flow. Specifically, it decreases it. You have to vent the same amount of mass out, but now you're doing it slower.
I will leave the real sciencey stuff for your research, but you'll have increased pressure on the exhausting side (and therefore reduced force, acceleration, and speed) with more flow restrictions.
Reference: pv=nrt and basic piston dynamics (specifically, f=A*delta_p) for the sciencey stuff.
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