This is interesting. I wonder if the Mirage uses a tuned exhaust in any sense, and I wonder how a mod like this will affect exhaust tuning and performance.
It is my understanding you would want a resonator chamber as close to the exhaust ports as possible, then have a specific size tube the rest of the way to the exhaust tip to maintain a constant velocity to help 'pull' the exhaust pulses from the cylinders.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)