GM's current limiter is built into the module, not the coil. As the primary winding approaches full saturation, the current control is visible on an oscilloscope waveform of the primary ignition circuit as a squared-off step-down of the sweep. It's not there on most non-GM modules.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!