Most of the gains from an aftermarket header will come from no cat. Just buy one from a reputable company and it will be fine.
I am suddenly remembering all the “gains” OTL claimed on their second gen header. They never posted a follow up that they said they would and independent tests proved them liars. Made me giggle.
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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