What have guys used for boosted M42s? I would like coil on plug but not too sure that standard M5x units will have enough beans for what I'm going to be doing.
Can anyone confirm that they're fine for up to 500rwhp, or if they are not, what you are using instead?
Can anyone confirm that they're fine for up to 500rwhp, or if they are not, what you are using instead?
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