JB1 activates above 9psi. JB4 has access to pedal position as well do works quite a bit differently.
Thanks George for clearing up confusion and misconceptions.
I would think that since your car is still so new, JB4 would be a good route to go to maintain a warranty. I have also seen good number son JB4 and in the future you can sell it/ piggy back it or use it with water/meth.