Exhaust and intake systems are like a wind or brass instrument. They can be tuned for a specific tone but remember that it's an instrument which is only capable of one note and that outside of that range it's always going to shift. Really there is a LOT to the design of exhaust and intake systems, much of which is way beyond me, and so we just set a goal and do what we can to meet it and if we lose or gain 2% power then we live with it.... it's not going to cost most of us any races anyway.
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