For people where emissions testing is bi-annual or even annual (some counties in California) there is good reason to just leave emissions intact. Especially with how good def/dpf trucks are doing with mpg & power lately. Emissions friendly tuning is only inevitable
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2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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