Thread: Exhaust valve mod?
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      08-17-2017, 09:25 PM   #32
jmorgan911
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Drives: 991 Turbo, F90 M5, Range Rover
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Quote:
Originally Posted by Nuckle View Post
What does "drone" mean?
When the exhaust sound resonates in the interior of the car, it makes a loud low pitches "booming" sound. Happens with some aftermarket systems.
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