Ran them on Dad's wagon today. They had around 10 dBA difference at idle, 7 dBa at 2200 and almost 10 dBa at 3500. They really snarl on his car when you goose the throttle but when closed, the engine is just about the loudest thing you hear, with the hod open, and from the drivers side anyway. His big 455-based engine makes much more sound energy than my little 340 Plymouth for sure!
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Tom Hand
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