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I wanted someone to explain something to me plz...on the hytech header, what is that part on the primary that is thicker for about 3 inches long and then goes back to the orginal thickness. heres a pick of what im talking about:

http://www.theoldone.com/articles/badtothebone/hytech_header_2.jpg

is the pipe the same diameter throughout the primary and that bulge is just something so that they can connect the primary in sections...or does the header change its thickness and then go back to the orginal for that 3 inch section. and if so, what purpose does that serve. thanks, this has been really bothering me.
 

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Those are called anti reversion chanbers. They are used to keep exhaust from being sucked back into combustion chamber when the intake valves open (just befor the exhaust valves close). Those are one of the main reasons the hytech headers blow those crappy comptech/weapon R knock offs out of the water. They don't use them cause they don't understand them.

Also I believe there was "the great header test" on honda tech. You can really see the difference on the dyno, and the hytech was not even built for the motor it was used on.
 
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