SKU: 55452161434

Flow Designs GT Mustang S550 FM Flow-Lock Rear Diffuser

Sale price$171.00 Regular price$190.00
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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14

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Description

Flow Designs GT Mustang S550 FM Flow-Lock Rear DiffuserSuits 2015 2017 Ford Mustang GT S550 FM INSTALL DOES NOT REQUIRE REAR BUMPER REMOVAL Details Experience Flow Lock rear diffuser for your Mustang S550 FM, sharing the same durability and technology as our renowned WRX, Golf GTI & MK3 Focus RS line up which is trusted by car enthusiasts worldwide. The rear valance and diffuser fins will clear the Mustang S550 FM dual exhaust tips with ease, and rear bumper removal is not necessary for installation of

Suits 2015-2017 Ford Mustang GT S550 FM

INSTALL DOES NOT REQUIRE REAR BUMPER REMOVAL



Details

Experience Flow-Lock rear diffuser for your Mustang S550 FM, sharing the same durability and technology as our renowned WRX, Golf GTI & MK3 Focus RS line up which is trusted by car enthusiasts worldwide. The rear valance and diffuser fins will clear the Mustang S550 FM dual exhaust tips with ease, and rear bumper removal is not necessary for installation of the diffuser. 10 year warranty applies for the rear valance (excludes ABS fins).

The Flow-Lock interlocking system allows for the final assembly of the diffuser fins without tools or fasteners. A simple push and click and the kit is assembled and ready for installation - this means zero exposed hardware giving you the cleanest look for your Mustang S550 FM rear. Front lip splitter is also available for the Mustang S550 FM.

No more L-brackets, no additional exposed hardware and no double-sided tape, experience the Flow-Lock difference today!
 

Valance is installed to the car through bolts and nuts while the Flow-Lock diffuser fins simply click into the valance (once locked into the valance it is secure). It is also possible to install when your car is on the ground.


GT Mustang S550 FM Rear Diffuser Kit Includes:

  • Mustang S550 FM rear diffuser (rear valance and Flow-Lock diffuser fins)
  • 2 Flow Designs stickers
  • Fitting kit

GT Mustang S550 FM Rear Diffuser Material & Finish:

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

Others Who Own This Kit:

Tell me about ABS plastic!

Please note that although all our precision-made ABS accessories are extremely strong and durable, they do not hold the same shatterproof label as our 10mm thick polyethylene composite splitters. The accessories are manufactured in ABS with the intention that they will be lighter, bolt-on attachments that will improve aesthetics and are easily replaceable if they become damaged from varying road conditions. 

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: 55452161434

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S. Alverson
Louisville, US
★★★★★ 5
Full, Fluffy & Perfectly Supportive Euro Pillows!
These Euro size pillow inserts are fantastic! They’re soft, full, fluffy, and hold their shape very well. The firmness is perfect — supportive without feeling too hard. They filled my pillow covers beautifully and made the bed look much more luxurious. Great quality for the price and very comfortable for lounging or sleeping. Very happy with this purchase!
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Reviewed in the United States on May 13, 2026
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Amazon Customer
Fort Morgan, US
★★★★★ 5
amazing.
WOW. I was really skeptical, but the other reviews are spot on: these are amazing firm pillows. I really hope they don't lose their firmness and become lumpy like other pillows tend to do. Excellent pillows for the price!!
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Reviewed in the United States on June 7, 2026
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Moranda
Lowell, US
★★★★★ 5
Great quality!! Great price
Bought these for my mom and omg i like them better than the ones I got on Amazon theyre super comfy and they bounce back up they dont flatten and im definitely buying some next for me definitely worth the place great price and the make seems real good quality
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Reviewed in the United States on June 3, 2026
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Mack Mackenzie
Phoenix, US
★★★★★ 4
These are very thick pillows.
Exactly as advertised. They are very firm and very thick. They're too thick for me to be able to use as bed pillows. However, they seem to work pretty well as cushions in my papasan chair on top of its normal cushion also work very well as decorative pillows. I'm still giving them four stars because they're exactly as advertised and they seem well made. My only complaint is that they're just too thick. And that's definitely not the fault of the pillows or the pillow maker.
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Reviewed in the United States on May 12, 2026
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Robin Smith
West Palm Beach, US
★★★★★ 5
how good the product is
Item Package Quantity: 4, Size: Standard
These pillows are soft, fluffy, and surprisingly supportive for the price. They’re comfortable no matter how you sleep — whether on your side, back, or stomach — and they maintain their shape well overnight without going flat. The fabric cover feels smooth and breathable, keeping things cool through the night. After a few days of fluffing and use, they settle nicely into a perfect medium firmness. They also wash and dry easily without clumping. Overall, a great‑value pillow set that offers comfort, versatility, and quality — ideal if you need an affordable yet cozy bedding refresh.
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Reviewed in the United States on April 10, 2026

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