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Q: Intermitent whistling sound from front drivers side of engine at low speeds? on 2000 BMW 328i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had intake boot replaced. Still makes noise periodically. Doesn't affect driving/engine performance.
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The accessory belt idler pulley can make whistling noises, especially at start up. If it's not coming from the front of the engine, and sounds more like from the top of the engine, then it could be the intake manifold runner valve, but that one would affect engine performance.
Thanks for the input. Noise went away on its own. It's been well over two weeks. Runs fine. Just don't get it.
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