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Go with triple chambers.
I've got a 65 coupe with Flowmaster 40 series twin chambers on board. They sound mean as hell BUT if I drive on the highway for ANY length of time, the resonance will kills my hearing. Flowmasters are a little notorious for that, but they also DO have that distinct sound. My suggestion if you're dead set on that brand, get triple chambered mufflers, they do cost more, but are worth it. Also if you're getting all new plumbing, be sure to install an H pipe to equalize the pressure, again this will lessen the resonance from 2000-3000 RPM.
I'm saving up for a set of triple chambers myself as I don't want to be investing in a hearing aid after my next trip to the shows.
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