ok, I'll make this short, simple and sweet. It's worth the $320 all day. The day to day drivability isn't any different that I can tell. Now, once you get into the gas a little it a noticable difference. The mid-range, part throttle pull is much better and the high-range pull is MUCH better. I can easily see how this tune is good for .3-.4 in the 1/4. This thing is an absolute beast now. I'm going to have to "learn" how to drive it better before I do anything else to it. I love it. Highly recommend it.