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Bootmod3 lets you choose when the exhaust flaps are open. To be fair, it wont always sound like a cold start, but i have mine set up so that in sport or sport plus the exhaust valves are 100% open, but in comfort they follow the factory settings. That way the exhaust is loud when i want, and quiet when i dont. I did fit the M6 mufflers though, so it is always a bit louder than stock.
If you are running aftermarket exhaust with out the valves, as others have said, catless down pipes are what you are looking for.
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