[C. Ludwig]

Pretty much any EMS. The IGN-1A has a built-in ignitor, so the stock ignitor is not needed. I've used these with Haltech and PFC with great results. I know they work with Microtech, Motec, and the PnP AEM. If you're using the universal AEM, with the built-in ignition driver, you'll need the standard IGN coil without the ignitor.

If you wanted to use them with a stock ECU and stock ignitor you'd probably not have real good results. The IGN coil draws some pretty serious amps and needs a high output ignitor to function properly.