The PP pkg comes with a variety of "extras" not common to the Non-PP equipped cars.
It also depends on the model years, as far as what you get.
All PP Equipped cars come with the 3.16 axle. Non-PP come with the 2.77.
There have been many debates on the differing axle ratios and what's perceived as being "faster".
It has been shown, time and time again, that when a tune is applied, the Non-PP's are consistently faster.
Moving along, again depending on model year, the PP equipped cars come with better brakes, and a slew of auxiliary coolers, that certainly help make the PP Equipped cars able to handle true track (& street) duties efficiently and worry free.
With the exception of the water cooled PTU, all other auxiliary coolers from a PP Equipped car can easily be retro fitted onto a Non-PP car.
I'm sure others will chime in after me, but that is the jist of it, in a nutshell.
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