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Originally Posted by Ammonia
Maybe I went full-retard but I can't tell for sure if those are EL or UEL hahaha
The design is a little odd too. The pipes merge before going to the collector, is that a flow restriction/disruption? Can someone a little more engineering savvy chime in here?
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The design is sound. It is commonly referred to as a 4-2-1 design. Two cylinders opposite in the cycle are merged so there is minimal interference from their pulses. The other pair does the same thing and then the two are merged together instead of all 4 dumping into the same collector. With the nice long runners it should do better than the stock header, which is limited in length by the space taken up by the cat. That is pretty much everything I know about headers so don't look to me to elaborate.
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