I've installed and tested several of the Jet modules.
I wrote the original installation instruction manual that comes with the unit.
I also wrote the install guide for
http://www.ptdiy.net, but it has since been removed for reasons that I explain here:
The PCM doesn't read the sensors effected by the JET anytime you're over 80% throttle angle. So... whenever you punch it, the PCM goes into a pre-programmed timing and fuel strategy.
The JET will add NOTHING at 80% to full throttle. That's when you want it the most.
Even JET is backpeddling and doesn't even offer this useless junk to you.
When I wrote the installation manual for them and then performed extensive testing of the datastream, I wrote to them about my findings. They now refuse to even acknowledge my involvement.