70 GTO question - The Supercar Registry

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70 GTO question

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#24

01-07-2006, 06:07 AM

Tom Hand

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Re: 70 GTO question

BelAir, they use a former heater/ac vacuum actuator to pull a rod that opens a valve inside the muffler letting the exhaust bypass two of the pass tubes internally. Essentially, it is like running a straight pipe and a very very quiet perf. muffler and being able to switch between them using a vacuum switch.
Tom

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