This is a combination of the air being pulled in and the engine lowering your gas efficiency. It happens when you twist the throttle too hard and too fast. Enjoy the ride. We do.I finally got to try the Flash today after a long winter of waiting (I had the ECU flashed in the winter Holiday Season). The ride is now much smoother when the engine is asked for Torque and the lugging is all gone! I will not repeat all that's been said, but guys I am so happy about this. I just wanted to add that I can now clearly hear the air sucked in the air box (stock) at each gear shift when I pull hard. This is a side effect I guess, which I think is cool, but I can't explain. Sounds like a performance modified engine.