Just looking them over real quick, no differences in the fuel mapping however it for some reason they have opened the secondaries 100% at closed throttle on tunes 20148, 20149, and 20151 in every gear where as before it was any where from 22 to 33% in the first three gears. Tune 20150 remains like the previous tunes. I haven't been able to open the 20145 tune.
Looks like 20149 tune (aftermarket exhaust with cat box removed) has power restrictions 1st through 5th gears via retarding the iginition. There is no difference between the ignition maps for 1st through 5th. However all of the other tunes have 3rd through 5th gears advanced, just like the previous series of tunes.
I am having a few issues with Tunedit program opening the new tunes.