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  1. renyo

    header design with sequentially siamesed exhaust ports?

    I was wondering about the impact about the odd heads on my engine on header design. I have a (Subaru) H4 - 16v (gasoline, spark ignition, naturally aspirated) engine. The exhaust ports on each head are siamesed together. The firing order however fires left front, back, then right front, back...

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