Why. Why would you ever buy this? You just spent $50k on a car, engineered for optimal power and fuel economy, and then you stick this on your brand new vehicle that makes a cool "whoosh" sound, and they offer no dyno results? Never mind any increase in performance, but you say the turbo sounds stressed? In a world full of bad product that is sold on no merit and purely marketing, I'd never put anything like this on my vehicle.
The whistle it goes woot woot, etc.
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Ryan
2015 F30 335i
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