BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > F20 exhaust rattle
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      03-28-2023, 06:39 PM   #1
jurajb
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F20 exhaust rattle

hi all,

I got an exhaust rattle, mainly when idling on my 125i

View post on imgur.com


I was told that it's cat so I've booked service with BMW for mid April but wonder if, for that cost, I should just get custom catback exhaust with better sound and more (little more) power.

Or is it something else possibly?
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      03-29-2023, 02:04 AM   #2
IJO
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A cat back exhaust is just that - after the cat so wouldn't fix a faulty cat.
(would be a waste of money performancewise)
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      04-23-2023, 12:24 PM   #3
colpeas
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Sounds like a loose clamp somewhere.
Mine had a similar problem, but not as loud and was audible only after a cold start. Turned out it was a decoupling element behind the DPF, which I don't believe that 125i has.
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