My car has always shifted into 4th at about 43 mph (cruising). In this gear and speed, the RPM'* drop down low and can't produce enough torque to accelerate at WOT. The computer senses the influx of fuel and to prevent the cylinders from flooding by downshifting the trans.
Factory settings: Cruising around 40 mph, then WOT will only drop to 2nd.
INTENSE settings: Cruising around 40 mph, then WOT drops to 1st and takes it up to 50 or so before going to 2nd. Going into 2nd, the RPM'* are higher than factory, thus producing higher torque and acceleration.
This is because the RPM limiter is moved up to 6000 vs. factory settings of 5000. Also, I noticed that because of the changed shift points, my car used to shift from 2nd to 3rd at 90, now it'* around 95 (It may be higher, but that'* what I noticed before 2nd INTENSE PCM was installed and CASE learn). Woo Hoo!