Here are before and after sound clips of the catless downpipe from Active Autowerke on a 2011 BMW 335i (E92, N55).

Before: I didn't have my tripod handy, so I mounted the camera to the rear bumper with a suction mount.

After: Using my tripod, I set up the camera a 3-4 feet from the rear.

Other than the catless downpipe, the exhaust is 100% stock.

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