★★★★★ 5
Fits perfect
Fits perfect in 2018 x5
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Reviewed in the United States on May 10, 2026
C.A. Technologies/ C.A.T. REPLACEMENT CARTRIDGE FOR MAINLINE COMBO (2ND STAGE)
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
C.A. Technologies/ C.A.T. REPLACEMENT CARTRIDGE FOR MAINLINE COMBO (2ND STAGE)REPLACEMENT CARTRIDGE FOR MAINLINE COMBO (2ND STAGE) OEM product from C. A. Technologies. Part number: 52 558 Prop 65 Warning! This product can expose you to chemicals which are known to the State of California to cause cancer. Ships factory direct shipping times can vary
Quick Dispatch:
Your C.A. Technologies/ C.A.T. REPLACEMENT CARTRIDGE FOR MAINLINE COMBO (2ND STAGE) orders ship within 1-2 business days.
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- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.6 ★★★★★
Based on 79 reviews
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Product Reviews
★★★★★ 5
OEM quality
BMW dealer wanted $300 to replace the cabin filters. Watched a 5 minute video and ordered these up. Look identical to OEM and easiest cabin filters I've installed.
Save yourself a ton of money and install these yourself. BMW quality without the BMW price.
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Reviewed in the United States on August 26, 2025
★★★★★ 5
Great filter!
Excellent filter! Fits my 2017 BMW X5 f15. Eliminates all external odors from the street.
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Reviewed in the United States on November 23, 2025
★★★★★ 4
Fits bmw x5 35i 2015
Installation was pretty easy. Works as designed. Will update.
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Reviewed in the United States on July 16, 2023
★★★★★ 5
Great price
I love Mann filters. Great for the price and great quality. I was surprised how cheap they were ( my car takes 2 filters and two come in the box). They fit like a glove and now I am enjoying fresh air
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Reviewed in the United States on March 30, 2026
