They dont! If they are way off just build and open plenum before it it’ll run fine. Your not trying to beat people by .001 here. I’ve seen guys w the ugliest crap log on one side and full on race header on the other and the cars runn like an animal . Don’t sweat it.
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Happiness is just a turbocharger away!
960 HP @ 11 psi, 9.70 at 146.
Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug!
selling turbos and turbo related parts since 2005!
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