I don't know if that header will work properly on North American Market mirages. A lot of overseas models don't have a maf, basically have a different way of running in a way.
And compare where the front o2 sensor is located in the header compared to either manifold style Mirage. It might run like caca. I'd do some more readings.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)