Exhaust Sound Shaping: Active Systems

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An article from MOTOR magazine ... with soundclips
http://www.motor.com/newsletters/20140120/WebFiles/ID_SoundShapingExhaust.html

The Faurecia Group demonstrating its Exhaust Dynamic Sound Technology
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The 2014 Chevrolet Corvette Stingray (left) and Jaguar F-Type S (right) both feature active exhaust technology developed by Tenneco Inc.
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Active Exhaust by Roush:
http://activeexhaust.roushperformance.com/

2015 ROUSH Stage 3 Mustang Active Exhaust System
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2015 Mustang EcoBoost Roush Exhaust New Activ8 Performance RS1
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Ferrari 458 Spider vs Jaguar XKR-S: which sounds best?
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Now:  Spires Jaguar XKR 4.2 Active Exhaust
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A couple of older articles from AUTOSPEED:
Pure Pipe Perfection 2 - Introducing the Secret Weapon...
Active Exhaust Systems' latest electronically-controlled exhaust butterfly...