Rolling coal and having excessively smokey diesel tunes were at one time widely believed to be part of the cost of performance, and even trendy, but according to and with explanation to back it up from Gale Banks of @bankspower, those days are gone and for some never even occurred.

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Many people believe removing the emissions tools like their Diesel Particulate Filter (DPF) and Diesel Exhaust Fluid (DEF) systems are the only way to make power on their street vehicles, however with a focus on retaining the same AFR by having greater air density being utilised as well as more fuel being introduced the same factory DPF cycle rate that is used from the factory can be retained with gains of 70-100HP and 120-140 lb-ft of torque being seen, without any major modification.

Gale also touches on towing concerns being non-existent with this approach, how the EPA is becoming more and more of a consideration in the US market and also exactly what the DPF does and why you don’t want to have it cycling through regens any more than absolutely required.

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