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| In Stan's "TRI-Y DESIGN" headers, the primary tubes are paired in a 4-into-2 and 2-into-l formation. This increases the cylinder scavenging effect and improves engine breathing by utilizing the exhaust velocity of one cylinder to help the exhaust velocity of another.
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| WHY "TRI-Y" HEADERS
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| Tests have indicated that the late model vehicles with lower operating RPM ranges function (Scavenge) more efficiently with the " TRI-Y DESIGN". Stan's "Tri-Y" headers were specifically designed for these engines. While 4-tube headers are well suited for some applications, the "Tri-Y Design" is significantly more effective on most street and off-road applications including the late-model, low-compression "Big Blocks". Header part numbers with a "Y" are " TRI-Y DESIGN ", the others are 4-tube.
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