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hmmmm... i have the 2.0 4 cylinder EcoBoost in my Focus ST... also have the 3.5 EcoBoost in the Flex... and when they were both stock you basically heard zero turbo noises! It's like Ford doesn't want any of the EcoBoosts to give off any tell tale sounds... Now it may be completely difference when it comes to an EB in the Mustang
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