SKU: 90367774446

Flow Designs MK3.5 Focus ST (Facelift) Rear Diffuser Set

Sale price$189.00 Regular price$210.00
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  • USA
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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Description

Flow Designs MK3.5 Focus ST (Facelift) Rear Diffuser SetSuits MK3. 5 Focus ST model INSTALL DOES NOT REQUIRE BUMPER REMOVAL Details: Each diffuser fin is reversible giving you 2 style choices to choose from. Diffuser fins are also slotted which gives you the flexibility to set the depth. Pull them out for an aggressive look or push them in to keep it neat and tighten when done. Diffuser fin profiles can be set before or after installation, adjustment can be done on the car by loosening a few fasteners


Suits MK3.5 Focus ST model

INSTALL DOES NOT REQUIRE BUMPER REMOVAL



Details:

Each diffuser fin is reversible giving you 2 style choices to choose from. Diffuser fins are also slotted which gives you the flexibility to set the depth. Pull them out for an aggressive look or push them in to keep it neat and tighten when done.

Diffuser fin profiles can be set before or after installation, adjustment can be done on the car by loosening a few fasteners (refer to fitting diagram).

This 8-piece set includes a pair of adjustable diffuser winglets and a pair of spats for everything to mount to. Everything is pre-drilled and there is no need to remove the rear bumper for installation, only basic tools and knowledge is required.

Don’t want the fins? Click here


Kit Includes:

  • MK3.5 Focus ST (Facelift) rear diffuser set
  • Rear Adjustable Rear Diffuser Winglets (Left + Right)
  • 2 Flow Designs Stickers
  • Fitting kit

Material & Finish:

  • Valance: 10mm thick polyethylene composite, bevelled edges
    Finish available in gloss black, or scratch-resistant textured matte black
  • Flow-Lock diffuser fins: 4.5mm thick textured ABS 

Install Instructions (PDF)

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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
SKU: 90367774446

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K
Verified Purchase
Khaleesi
West Palm Beach, US
★★★★★ 5
Great filter and easy installation
Style: BE-159 1-Pack, Style: BE-159 1-Pack
For my 2016 Hyundai Sonata Hybrid Limited. I cannot believe I paid so much more for a brand-name filter that does the same thing as this one. It is made of the same material as the dealer one I took out. Very easy to install, cant believe I paid for this to be done in the past with oil changes. Requires no tools and did not get dirty at all. No mechanical skills needed, especially if you run into trouble and can use YouTube. PROS - great quality, cannot tell that it is after-market - very professionally made, not irregularities seen - excellent fit in position, no adjustment needed - very easy to install, cannot believe I paid to have this done in the past - no mechanical skills needed to install - great price compared to what big name productions want for the same thing - cannot tell the difference in air quality between this and the dealer filter I took out - removes outside odor completely - did not require tools are getting dirty CONS - None
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Reviewed in the United States on May 30, 2026
J
Verified Purchase
JimXeod
New York, US
★★★★★ 5
Fits perfect and works as designed. Flows like OEM and looks well made.
Style: BE-553B 1-Pack
This filter is very comparable to the stock filter. Fits the BMW G20 just like OEM. I would not say it is two times "heavier" as advertised on the box, but it is very comparable to stock. It's the same weight and similar construction. BMW has a very robust cabin filter. This will be my go to. I did purchase another aftermarket cabin filter that fit well, but was thin, flimsy and had a bad chemical odor. This one is fine and airflow is the same as OEM. I change them every year or so. I don't worry too much about longevity with cabin filters personally.
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Reviewed in the United States on May 15, 2026
S
Verified Purchase
S. Phillips
Waukegan, US
★★★★★ 4
Good quality but it was slightly longer than original and needed modification.
Style: BE-182 1-Pack
Bought this cabin filter for a 2023 Acura TLX. While the filter seems to be made of quality material, it was just a little too long (about a 1/16 of an inch, so I had to trim it to make it fit so the cover would fit snug. I was able to do that without compromising the filter itself. But this might be an issue for some people
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Reviewed in the United States on May 8, 2026
K
Verified Purchase
Keith Granholm
Houston, US
★★★★★ 5
Fits my Chevy 2021 Bolt Premier perfectly.
Style: BE-966 1-Pack
Installation was a breeze, fir nicely and the air in teh car now smells fresh and clean. The old filter has developed a musty smell so this new one is great. Had it replaced in under 3 minutes.
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Reviewed in the United States on May 18, 2026
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Punkizback
Pawtucket, US
★★★★★ 5
Fits perfectly for my 2017 VW Passat
Style: BE-373 1-Pack, Style: BE-373 1-Pack
Bought this for a fraction of the cost. An auto shop wanted to charge me $72.99 for a filter so I bought this Spearhead brand cabin filter and its the perfect size and its just as sturdy as the previous one the dealership had in the car. Not sure yet how the airflow is or if anything different as I have not driven in the car since it was replaced, but it appears to be a very high quality cabin filter for my car at a great price.
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Reviewed in the United States on May 25, 2026

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