predator's are all dead and gone.. were all discontinued about 3-4 years ago now.. so you definitely don't want to get a predator...
you'd want to get the diablosport inTune or Trinity.. either one would support the vehicle.. and both have tcm/tranny support if you have an auto tranny...
as for the difference between the two... tune-wise, the tunes are the same. adjustable parameters are the same, and custom tuning can be done for both of them as well...
The Trinity has a few more features, including a performance monitor for 0-60, 1/8 mile and 1/4 mile times, etc... bigger color touch screen... graphic virtual gauges for monitoring data... it has a windshield mount (like a gps)... you can watch/view the data without having to hold it, since it's mounted to the windshield...
The inTune is smaller (it's the size of a credit card), it does not have the performance monitor, and does not have the graphic virtual gauges, etc, but it's less expensive...and it's a little easier to use than the Trinity when it comes to data logging and importing/export tune files for custom tuning, since you don't have to use any extra software - everything is just copy/paste with the inTune.
here are links to their user manuals so you can check them both out:
Trinity user manual:
http://diablosport.com/manualFiles/T...ser_Manual.pdf
inTune user manual:
http://diablosport.com/manualFiles/i...ser_Manual.pdf