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Drone is precisely why I went with the DINAN exhaust over other manufacturers with my E90M3. If in fact there is 'drone' especially at cruising freeway speeds this is in my opinion a design flaw. Tuners are able to develop sportier high flow after market exhausts without drone if they do the proper R&D. I'd be interested if the 1M internals of the exhaust has a Helmholtz chamber or not.
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