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This is just a quick video to show the sound difference between the stock exhaust on a 2019 Subaru WRX STi vs the Invidia Q300 catback exhaust system. It will also illustrate the decibel levels of the Q300 exhaust utilizing the measurements provided by the referees in the state of California. Please note this is not the exact model decibel meter that they use but it was performed in the same manner they will do it in at their required measurements. Filmed with Sony A7R3, Rode Mic, and GoPro Hero 7 in the cabin of the car.
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