I have a jb3 and the cantool. If you notice the cantool does not really give an accurate boost pressure reading since its plugged into the obdII.
If i had a jb4 connected in the engine bay it would be more accurate.
I know its hard to compare I wish I edited the originals and synced them but I deleted them off of my phone.
With my stop watch I estimate a .6 sec improvment.