Tweecer and MAF calibration

Normally the only difference is the range of air it can measure. A stock meter maxes out around 700kg. My 30# cal'd PRO-M maxes at 1562kg.

So the only real advantage is you can use it for bigger/better mods later if it is cal'd higher. The down side is if it is cal'd to high it can make it harder to make perfect at lower rpm's.