These are flexible, usually accordion – shaped, rubber pieces. They’re designed to connect parts while still allowing for movement or vibration. Think of it like a stretchy connector. They seal things up, prevent leaks, and protect the components from dirt and moisture. Some bellows also help dampen noise and vibration. On your intake manifold, this bellows typically connects the air intake to the engine itself. It allows the engine to breathe, but keeps outside contaminants from getting in. It needs to expand and contract with engine movement, so a rigid connection just wouldn’t work. It bridges the gap and allows everything to flex as it’s supposed to. These aren’t something you generally notice until they fail. If it cracks or tears, you’ll start getting unmetered air into the engine, which messes with your air – fuel mixture. That will likely cause rough idling, poor performance, and a check engine light. It acts like a shield against the elements, so once it’s compromised, things go downhill quickly. You’ll notice if it’s gone bad because the engine won’t run smoothly. You can often find a replacement on a site like Fixparts Online, and they’re usually fairly straightforward to install, but it's important to address it promptly to prevent further issues. Built to endure: Rubber Bellows (MPN 13711726205) comes with a 12-month warranty!

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• Get parts made specifically for your BMW, ensuring a perfect fit and optimal performance. • BMW parts are engineered to last, meaning fewer repairs and more time on the road. • Using genuine BMW parts helps maintain your vehicle’s value. • You’ll get the same quality and reliability that BMW is known for, giving you peace of mind. Performance you can rely on – BMW parts from FixParts Online.