It will adjust to a point, but any electronic fuel injection system reaches a limit to how far it will adjust. Seat of the pants estimate on the 2012 998 was about 10%. So, based on my mods, I started bumping up against the Bank 2 Lean code (rear cylinder), depending on the weather and brand of gas. Front cylinder stayed in spec. The Power Commander is the only system that will work on the 2012 998. Juice Box is obsolete now, and would not work correctly anyway because it didn't intercept the signal from the O2 sensor. Unless you plan on spending a lot of time running at high RPM and high throttle settings, the Auto Tune wouldn't really be necessary, since you are only going to be accepting the trim values from it in the open loop area of the map. The Power Commander still maintains closed and open loop operation of the on board system.
Big picture, if you want to be successful with the Power Commander and understand what it's doing and how it's interfacing with the on board system, spend some YouTube time learning about fuel maps, open and closed loop operation of the fuel injection system, and the operation of short and long term fuel trim. It doesn't matter if they're talking about cars, trucks, or bikes - since the advent of the 3-way catalytic converter, it's all about the same.
