Re: Ported stock headers
Though it may not be a big deal in this case, but usually in the performance world, it is best to have a slightly smaller exhaust port dumping into a larger header runner, or having a conical shaping to the ex port to help reduce the risk of exhaust gas reversion. Though it would best if the runners within the header maintain the same diameter.
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1990 Nissan 300ZX TT
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