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It looks like Classic Retrofit has never completed the boost retard project. To get the most out of a CD box replacement you must have the boost retard to control spark timing as boost comes on. Tis way you can run more advance through the RPM range up to boost coming on when the MSD unit will then start to pull out timing. For this reason I would go with the MSD unit with boost retard function. I believe this is accomplished with a MAP (Manifold Absolute Pressure) sensor.
Rahl
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