Edge Products Evolution CTS3 Tuner (85400-200)

A tuner is a small box that plugs into the diagnostic port under your dash and changes how the engine computer manages fuel and boost, so the truck makes more power without swapping any physical parts. This one is Edge's legacy-platform unit and covers every Duramax engine GM put in this truck from 2001 all the way to 2016, across 5 different engine codes as GM changed the design over the years, with a 5-inch color touchscreen for picking a power level and watching live gauges.

why this one — One SKU genuinely covers 15 model years and 5 different engine codes here because Edge tunes this as one product family with year-specific calibration built in, the same way this catalog already lists some diesel fuel-system parts as one row spanning multiple engine codes. The gain figure is a range rather than one number because a 2013-2015 LML making up to 135 hp is a very different result than a 2007.5-2010 LMM making up to 85 hp on the same tuner - use the number for your specific year, not the range as a whole. Edge is explicit on this one that it will not let you remove or disable emissions equipment like EGR or the DPF, which is worth knowing since some competing tuners are sold specifically to do that.