1)for 2x exhaust on an inline 4, you run a Ypipe from the header, which splits the exhuast
2) this is dumb because its pointless and imo (along with many others) looks bad/unneeded/tacky/pointless/ricer
3) you will lose power because of next to zero backpressure
4) you dont need that much flow...its almost the same as running straight header
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