“Coal roll” is modifying a diesel so it belches black smoke on demand—fuel turned into soot and applause from exactly no one.
In Australia it’s illegal: tampering with emissions gear breaches ADRs and state laws, and can earn defect notices and hefty fines.
It also wrecks air quality, irritates everyone behind you, and usually signals a bad tune rather than any real performance gain.
If your diesel’s smoking like a bushfire, it needs maintenance—think filters, injectors, and a proper tune from a reputable shop.
Short version: don’t do it; keep it roadworthy and enjoy torque without the smokescreen.
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