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my 91 camaro had headers+!cat+borla with open plate and i only registered about 78db reving it to 3K in my driveway.
the standard for testing is actually supposed to be at a load and engine rpm consistant with highway travel. teh testing equipment is also supposed to be 60ft away i believe, so it has to be loud enough to exceed 95db at part throttle from 60ft away.
i can't imagien a lot of systmes actually fail this kind of test.
later
tim
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