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QB,
Interesting concept and I like it much better than the single Flowmaster. I heard once the larger the can, the better the sound attenuation - so two must be better than one, and since they share the flow, you get half the backpressure in each. Probably the straight through mufflers will net you the best performance, such as the Edelbrock RPM series, Borlas with the lazy S core, and Ultra-Flos. I would imagine a controlled burble at idle, and a straight shot out at full throttle rpm.
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