The Profec B is the older style Boost controller, it is VERY easy to use and simple. Boost on the fly, just turn a knob !

The Profec B spec II is electronic and more involved and difficult to program. It is also very atmospheric dependant. You tune your car on a hot humid it will effect your boost levels, unlike the Spec B you set it and its the same boost no matter the weather or elevation.

Not to mention its cheap ! LMK I have it ready to go !!!