Quote:
Originally Posted by y420
what about primaries?
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As long as you use 300-cell metal core cats and you make sure the welds are strong and there are no leaks, then they should not cause a CEL. 200-cell or lower and you start getting too close to the threshold. With that said there is a decent amount of power to be picked up by the primaries as well (more so than the secondaries) which is where majority of the power comes from on medium/long tube headers that delete primary cats.