I have a 09 Cobalt SS/TC with the LNF and have been looking around the HP Tuners calibration file trying to find something resembling "Spark For Decel" that is found on Ford V8s with SCT Advantage.
I'm trying to retard the spark with closed throttle/decel to see if it will keep the exhaust gases flowing and not cause as much turbo lag during decel... and also to see if it will make the exhaust pop more. I found out about this on my Mustang GT and it sounds like the new Jaguar F-Type when decelerating!