From Wolverine Airsoft we have the Flow Reducer Set for INFERNO XTS Engine
This is a set of 3 flow reducers for the INFERNO XTS HPA Engine that lets you adjust the output pressure of the engine while maintaining a higher input pressure. This is useful in a variety of confirgurations whether you are running with the QUAKE MTW or for meeting lower energy requirements while maintaining a pressure that ensures reliable performance.
Flow Reducers
Blue - 0.08" ID for ~50% Reduction
Green - 0.10" for ~25% Reduction
Red - 0.13" for ~10% Reduction