Quote Originally Posted by darkhorizon View Post
Jet had one years ago.. it bumped shift pressure and did a few other random and probably pointless things but it did what it advertised
Not really. It installed between the ECU and the harness and just modified signals going to the ECU to fool the computer into reacting differently. SCT (Superchips) and other tuners plug into the ODBII port and actually modified the how the data is used like HPT or DHP does, but only with a few predetermined tunes instead of full control.