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Mike usually on roadster/cabrio you have less drone with the roof down.
The whole cabin act like an resonating chamber.
For example, we just had a Mini Roadster in for the full tune job (full oversize exhaust - downpipe, cat, centr pipe and muffler, Evolve Intercooler, Evolve R tune, Ohlins coilovers) and it sounds fantastic but it does drone with the roof up and the windows closed.
Do you have pictures of your car with the exhaust fitted? Videos?
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