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Interesting post. Im having 622 with PSO heads built and will need headers. It is a pump gas engine with shift points around 7000ish in a 72 Barracuda. Have been told TTI 2"-2 1/8" step with 3 1/2 collector will e enough. Im kinda skeptical about them. If need be ill have custom ones made.



Exactly what my sb w9 headers are.