worng. HFC and Cat back will produce gains with no remaping. It has been proven on the G37S. However intakes are a different story. Intages show low gains until a tune is done. Intakes is where you will want the tune not needed to see good gains from your HFC's and catback.
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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam
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