SKU: 63945032811

Flow Designs MK4 & MK4.5 Focus ST Flow-Lock Rear Diffuser

$171.00 $190.00
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  • USA
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

Flow Designs MK4 & MK4.5 Focus ST Flow-Lock Rear DiffuserSuits MK4 & MK4. 5 Focus ST Models INSTALL DOES NOT REQUIRE BUMPER REMOVAL Details: Get the Flow Lock Rear Diffuser for your Ford MK4 Focus ST or MK4. 5 Focus ST, which shares the same durability and technology as our renowned WRX, Golf GTI & Hyundai i30N line up which is trusted by car enthusiasts worldwide. The rear valance and diffuser fins will clear the Focus ST dual exhaust and rear bumper removal is not necessary for installation of the


Suits MK4 & MK4.5 Focus ST Models

INSTALL DOES NOT REQUIRE BUMPER REMOVAL

Details:

Get the Flow-Lock Rear Diffuser for your Ford MK4 Focus ST or MK4.5 Focus ST, which shares the same durability and technology as our renowned WRX, Golf GTI & Hyundai i30N line up which is trusted by car enthusiasts worldwide. The rear valance and diffuser fins will clear the Focus ST dual exhaust and rear bumper removal is not necessary for installation of the diffuser.

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 MK4 Focus ST or MK4.5 Focus ST rear bumper. 

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.

Kit Includes:

  • MK4 & MK4.5 Focus ST Rear Valance
  • MK4 & MK4.5 Focus ST Flow-Lock Diffuser Fins
  • 2 Flow Designs stickers
  • Fitting kit with black stainless hardware

Material & Finish:

  • 10mm thick polyethylene composite, bevelled edges
  • Finish available in gloss black, or scratch-resistant textured matte black

Install Instructions (PDF)

Others who own this kit

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: 63945032811

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4.2 ★★★★★
Based on 26 reviews
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Verified Purchase
Bil R.
Port Orchard, US
★★★★★ 5
Perfect fit for 5.7 Mercruiser
Great fit for mercruiser 5.7 Have had it installed for about 6 months and still working great!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
A
Verified Purchase
Arelius Walker
Pawtucket, US
★★★★★ 5
Great Buy!!! 5-Star!!!
Bolted up! Boat starts like the original starter! Great Buy!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2026
N
Verified Purchase
neil d.
Waukegan, US
★★★★★ 4
Seems good but not a direct replacement
This starter did work but it was not a direct replacement for the starter in my 1986 Malibu skier with 5.7 mercruiser direct drive. This starter is a mini-starter, which is great in that it’s smaller and lighter but it meant that my starter bolts were too long and I had to add 3/8” stack of washers under the bolt heads. The bracket that supports the front of the starter to the engine block was also not able to be used because the new starter is shorter, although with the lighter starter, that bracket is probably no longer necessary. First few starts have been fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 10, 2025
J
Verified Purchase
Jerry Sonnier
Louisville, US
★★★★★ 5
Fit Great. Works great.
Fit perfectly Mercruiser 4.3
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
A
Verified Purchase
Amazon Customer
Pawtucket, US
★★★★★ 5
Boat once again starts
Easy install once I figured out how to reach the starter. Worked first try and my boat is starting again. I think being a contortionist would help with the install since it is under the engine and boats typically only have access from the top. It probably took me an hour to get the old one off and about 30 min to install the new. The symptom of the broken one was a click sound when trying to start the motor, but nothing turning over. Same sound with new. Battery or a jumper.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 10, 2025

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