I fitted this axle to the rear exhaust or removed the muffler on my 2019 Wrx. It sounds great, it makes a nice pop when you downshift and when you upshift it makes a nice gurgling or loud popping sound. It is not noisy during normal driving, when you shift gears it is noisy and the popping will be loud. The exhaust doesn't hum. You'll notice the difference better with this exhaust than you would when you hit the gas pedal. If you are looking for a quality rear axle or muffler I would recommend this Magna Flow for everyday driving.
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