the new cross flow mufflers are straight through packed style. not the chamber type (Flowmaster, Spintech, ect). I installed Pypes 2.5" X system on my 74 about 500 miles ago. I am told that performance vs. a chamber type is very close. system is quiet IMO. I think 50 series flowmasters are mild for reference. Fit is very good. I odered mine through BSM exhaust in MA. good price.
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