Seibon 18-20 Subaru WRX / STI Carbon Fiber Rear Diffuser

Seibon 18-20 Subaru WRX / STI Carbon Fiber Rear Diffuser

Marsoni

M251S

$858.48

Get it in 3 business days with 1 day shipping. Friday, May 29

Seibon 18-20 Subaru WRX / STI Carbon Fiber Rear DiffuserSKU: RD18SBIMP UPC: 887753487704 Seibon 2015 2021 Subaru WRX STI Carbon Fiber Rear Diffuser Transform the rear end of your 2015 2021 Subaru WRX or STI with the Seibon Carbon RD 18SBIMP rear diffuser. This direct fit component replaces the factory valance for improved downforce and ground effects. Handcrafted from premium carbon fiber, it reduces weight while enhancing stability at high speeds. Key Features Lightweight Construction: Reduces vehicle

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The hole made by the included holesaw was the perfect size for the insert. They work well and cosmetically look much better than a raw hole in the wood. I tried the cable wrap and inserter and both make the job of wrapping and securing the cables much easier. Overall a good product and a good value.

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Reviewed in the United States on January 17, 2025

Verified Purchase

Grant

Grantham, US

★★★★★ 5

Great for small projects. Nice fit.

I purchased this set while building a couple of end tables. They fit like a glove and it's really nice that they come with the hole saw bit. It's a great set for what you get.

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Reviewed in the United States on May 19, 2026

Verified Purchase

Sia G

Natrona Heights, US

★★★★★ 5

My desk looks organized

Works great

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Reviewed in the United States on April 18, 2026

Verified Purchase

NegativeG

Waukegan, US

★★★★★ 5

Includes everything you need and a bonus to get the cord wrap

I bought this to route the cords up to the monitor on a height-adjustable desk. The top of the desk is an inch thick, and this was easy to drill through. To make sure I got a clean cut and did not damage the top, I put painters' tape on the area where I wanted to cut and drilled a small starter hole to get it exactly in the right spot. It cut a really clean hole from the top, and the plastic insert fit perfectly. Once I got the hole cut and the wires run where I wanted them, I put the cord wrap on. The tool that comes with the cord wrap is really slick and super easy to use. I was able to bundle together three cords that hang off the side of the desk. Given that the desk is adjustable, it was a nice bonus to get the cord manager with the kit, as it keeps the cords from getting hung up in the desk when adjusting it. I'm very happy with the purchase, great price.

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Reviewed in the United States on December 14, 2025