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ok, answered my own question (kinda). capristo make a muffler that does the job. the capristo muffler attaches to the mid pipes and has a bypass valve actuated by exhaust backpressure. backpressure builds (ie, rpm climbs) and the valve opens and bypasses the muffler. very cool, keeps the cats in the system (unless you delete them too).
similarly, porsche makes a muffler (the pse system) that uses the resonance flap vacuum as well as ecu control.
but they're also $2300 (pse) or $3500 (capristo)!!! now they both come with lectronics that allow to to control bypass valve operation, but i'm still sure you could do it with two valves and a vacuum switch for a lot less ...
Last edited by The Radium King; 01-05-2011 at 03:32 PM.
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