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THe torque curve looks quite good considering that it is an NA engine. with most of the torque available from 2500 - 7000RPM.
There could be a number of reasons behind the dip ranging from switching of valve timing, axillary components, intake and exhaust resonance, etcs.
For me, this slightly bumpy torque curve will give the engine a unique character. It probably won't win races but it will be more exciting to drive as the driver anticipate the torque build-up then followed by a rush from 4k to 7k (3000RPM).
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