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The FC trailing coils are great coils and dirt cheap but if you want the most out of them you need to charge them to 8amps or more (6ms + at 14v from memory). I'm not familiar with WRX ignitors but if they are current limiting then they'll most likely be no good with FC coils since they will probably limit to 7amps and end up overheating and splitting coils. Mitsi Evo and GSR 2 channel ignitors are non-current limiting and work great. Microtech X4 ignitors also work well with FC coils and are non-current limiting.
The ign-1a coils are badass and far better than FC coils, and the fact that they have a built-in 19amp IGBT driver says something.
The ultimate inductive appears to be ICE coils, however I'm working on an ignitor than can cope with 4ms at 24v because nothing else can so far.
BTW the ign-1a coils make more hp than M&W Pro14R CDI. The trick is finding compatible spark plugs, at least with pump gas anyhow. Alcohol is probably no problem.
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