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question is, how happy is the ecu with that.
the ecu has adaption channels, have a think about the parameters the ecu sees and how it adapts to the sensor voltages it sees and adjusts for these as well as general engine wear.
personally I'd fit a 100cpi cat minimum sort the vis if they aren't working (and they don't look like they are) and reset the adaption channels.
I think you may be confusing that kick you feel just over 4k with the natural intake pulse length harmonics that happen, looking at the graph I'd say no working vis and its just pulse length your feeling.
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