Changing The Alternator

Do you have a need for 150A? Modern cars have all sorts of electronics, e-fans, 9-speaker stereos, NAV, etc and only require a 120-130A alt to function.

A typical fox really only needs 100-120A unless you are running a high demand stereo. But even with an E-fan swap, you would probably never put more than a 100A load on your alt.

Most of these alt upgrades are because the stock 75A has piss poor charging performance at low RPM and becomes borderline undersized when you add an E-fan to the car. The modern 3G alt fixes this issue as long as you don't underdrive it. Going beyond 130A isn't really necessary. My point is don't pay for something you don't really need.