TLY - I have a diesel truck. But I've never had the desire to roll coal. I guess I'm just too conservative for it. Not only does it make us diesel truck guys look bad, but it's not good for the turbo, and wastes fuel. I don't like wasting fuel. Well, let me rephrase that ... I don't like paying for fuel, so I waste as little as possible.
If I can achieve decent (audible) results with the exhaust mods, I might *consider to make it repeatable. But exhausts are ... difficult, all the way around. Hard to get right (audibly). Not cheap to produce, not cheap to ship, low volume. Etc.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 50.9 mpg (Imp)