[Jeff@TopGearSolutions]

Originally Posted by RLe92335

JB4 has a Map 5 which auto-adjusts based on conditions: your other mods, air temps, etc. All I have is an intake and JB4 and I am getting around 15psi on Map 5 with cool air temps. I am very happy with it, and it is waaay smoother than the JB+. I started with the JB+ and outgrew it in two months.

IMO, the JB4 is worth it alone for the simple fact that you are also getting a code reader (if you dont already have one). I love knowing why my Service Engine Soon light comes on, and whether it is something worth taking the car to a mechanic for. If its not, clear the codes with the JB4 and move on with your life. Its great.