IIRC the correction on RR is about 1% of torque for 5degreeC change in temperature.

On Cruise or Acceleration on a decent (ie standard Focus) induction system or an aluminium long tube (AEM copy) system, ambient to AIT temperature difference is less than 1degree. On a RR, which is not a true test of the induction system, the loss due to filter box & snorkle was about 1.5% (just tb to MAF silicon hose and the MAF).

Martin