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as much as stock coils... which then depends on how much boost etc etc etc.

too many variables without listing your setup.

i got 330rwkw from stock coils before i needed more spark, not neccasarily bigger coils.

cheers

The ability of a coil to fire across a 0.8mm gap is essentially dependant on potential voltage difference across the gap and the conditions within the camber. When the density of the mass within the chamber is sufficiently high that ionisation cannot occur only an increase in plug current will propogate the spark.

Thats why a good CDI ignition system has a high secondary voltage along with a high current capacity.

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