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The ECU has thresholds to which it can change parameters for power. The catless DP exceeds this (because of the missing O2 sensor input) in which case the engine retards power due to tolerances and stays within spec. The midpipe does not have the missing o2 input, nor does it exceed these tolerances therefor its allowed to push to an efficient "power boost" setting.
In short a catless DP without tune will result in power loss due to missing sensory data input. A midpipe will not because nothing is missing and less restriction of flow.
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