IMHO the bung is so far down the exhaust that it will have no detremental effect, only a slight reduction in power.
Lucky's car is only 350BHP (ish) so the % loss will be neglegible.
If the restriction was in the header or up-pipe that may be a different matter because the exhaust gasses will struggle to escape at high rpm / high boost and may cause detonation.
The exhaust gasses are well on their way out of the exhaust by the time they have reached the bung and would of also disperssed, cooled and reduced in density at this point.
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