Most of the low end areas of the maps work well, on my personal program (in my car) I am running like 10% extra fuel at idle. Man does it purr. The stock program runs it too lean and it only idles well with race fuel. Also, the transition from closed loop to open loop is harsh in the stock program and it seems that on cars with any significant breather mods (exhaust) seems to not like this harsh transition when the engine is cold. You can see it on a dyno chart, no doubt. I dont mess with the idle and low load/low RPM (<2400RPM) because that gets into emissions and I maintain the stock program for that as I have not tuned with a gas analyzer. People with Zemulators will be able to take advantage of a rich idle, but be able to switch back when the go to emissions testing. But the airflow regions of the map that correspond to ~stock boost levels also get modified to smooth things out. When you look at a plane 3D display (like a wireframe landscape) I have smoothed out the map as even the stock program has some rather abrupt variations through the differing load bands.