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Unless you max out the MAF you don't need a larger MAP and in most PD blowers I've seem (not seen the logs of a Harrop for some time) the pressure wave resonance in the manifold has a negative impact on a wider range sensor that the OEM one isn't able to detect, hence it will run better on the OEM sensor. This is why many recommend the D-Box but is actually able to be mapped out quite easily on EcuTek.
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