Whistling MercedesBenz CLA whats going on here

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During the industry sessions at the Nürburgring we also filmed these Mercedes-Benz CLA's who made quite a weird high pitch noise at higher rpm's. Anyone know what it could, or what Mercedes is up to here? Obviously, the Turbo's are making this noise, but we've never heard this loud of a turbo whistle. • © Touriclips 2013 • Follow us on Facebook and Twitter as well! • FACEBOOK: •   / touriclips   • TWITTER: •   / touriclips  

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