That’s the sound of fuel burning inside the exhaust, usually happens because the engine was tuned. Normally when the engine is decreasing the ECU doesn’t send fuel, but the tune changes this, so fuel is always sent, but it doesn’t ignite the fuel right away, so the engine still slows down, the ignition happens later so the fuel burns inside the exhaust, this is typically done in turbo cars to keep the turbo spinning even when you are decelerating, which means better performance
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