The cruise uses whatever mode you are in whenever you engage it. My 2011 blew a ringland at 12,000 shortly after the 20g install. Had same symptoms. I combatted heat(wrapped downpipe, uppipe, headers. Heat was not the problem. It's fuel and the different fuel system they started using in 2008. I also changed the maf sensor, the map sensor and o2 sensor to no avail. Have your tuner monitor your fuel pressure. This is a good place to start.