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SpeedForm Sport Quarter Window Louver; Carbon Fiber Appearance (15-20 Fastback)

Item 403358
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Market Price $69.99 You Save 14% ($10.00)
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$59.99 (pair)

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      Product Information

      Features, Description, Reviews, Specs & Installation


      • Chevron Shaped Louvered Design
      • Hydrographics Carbon Fiber-Like Finish
      • Vacuum Form ABS Construction
      • Simple Peel and Stick Installation
      • Driver and Passenger Side Louvers Included
      • Fits all 2015-2020 Fastback Mustang Models


      Sporty Styling. A set of SpeedForm Carbon-fiber style Sport Quarter Window Louvers are a great way to add a sporty appearance to the exterior of your 2015-2020 Fastback Mustang. Featuring a louvered chevron design, these C-Pillar Window Louvers will enhance the bold styling of your S550 Pony's body lines.

      Quality Construction and Materials. SpeedForm's Sport Quarter Window Louvers are manufactured from vacuum-formed acrylonitrile butadiene styrene (ABS) plastic for its light weight and long lasting durability. These Quarter Window Louvers are then completed with a special hydrographics technique for a durable, carbon fiber-like appearance.

      Peel and Stick Installation. No messy glue or drilling is required for installation. These SpeedForm Sport Quarter Window Louvers are designed to attach to the factory C-Pillar glass with the supplied 3M doubled sided automotive bonding tape for a quick and easy installation. Just clean the surface, peel the backing and stick in place - it's that easy.

      Recommended Styling Upgrade. When installing exterior quarter window louvers or scoops on your Mustang, it is recommended to add a set of quarter window blackout decals to hide the ugly back side that wasn't meant to be seen by human eyes. See part number 386505.

      Application. These Carbon Fiber Style SpeedForm Sport Quarter Window Louvers are designed to fit all 2015-2020 Fastback Mustangs, including the V6, EcoBoost, GT, GT350 and GT500 models. Sold as a set of two, one driver side and one passenger side.


      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# 403358

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (20)

      Write a Review

      Ratings Summary

      4.4 out of 5 overall rating from 20 customers

      Installation Time: Less than 1 Hour

      • January 22, 2020

        5 2018 GT - Tanman99

        Absolutely amazing

        Absolutely love it on my mustang. Fits really well with my mustang and my rear louvers.

        Helpful (0)
      • January 08, 2020

        5 2017 V6 - MattD Installation Time: Less than 1 Hour


        Very easy to install and look great on the car. Did not have any issues with tape not holding.

        Helpful (0)
      • December 28, 2019

        5 2015 GT - Anonymous Installation Time: Less than 1 Hour

        Window louver

        The fitment was a bit off. And the tape that came with the louver wasn't sticking so I had to buy some 3m auto tape. But other than that's it was good.

        Helpful (0)
      • December 28, 2019

        1 2016 V6 - DaltonL Installation Time: Less than 1 Hour


        The carbon fiber film is starting to flake off. Very cheap material

        Helpful (0)
      • December 17, 2019

        1 2019 EcoBoost - Bad

        Very flimsy

        Not very impressed with these at all. Very cheaply made. But unfortunately the price on this website doesnt refect how poorly they are made. Garbage at best. They were broken when I got them delivered. So had to return, and that process was a joke. So I still dont have them installed yet.

        Helpful (0)
      • November 30, 2019

        5 2015 GT - jet1 Installation Time: Less than 1 Hour

        Best value going

        unbelievably good price for a quality product. I like it a lot and I get compliments from the public. My $200 louvers blew of at 80 mph. They didn't release air pressure. they were installed by a body shop because they needed painting and prep. So it was triple the money or more. These are finished and will not blow or suck off the car.

        Helpful (0)
      • November 21, 2019

        5 2017 GT - StevePerthWA Installation Time: Less than 1 Hour

        SpeedForm Sport Quarter Window Louver

        American Muscle sell top quality products and provide great customer support. Have fitter my new SpeedForm quarter window louvers to my GT FM fastback. Looks great. Kind Regards, Steve - Perth Western Australia

        Helpful (0)
      • November 03, 2019

        4 2017 GT - JamesC Installation Time: Less than 1 Hour

        Nice product for great price

        Installed in 30 minutes. Let sit all night. Within a week I had to re-apply tape to one area but that was a small 3 inch section. At a month these have stayed on through driving rain, 90 degree Florida sun, 90 percent humidity, and 100 mph driving to see if they stayed put. They did. Looks great. Can still see through the slots so haven't lost any visibility.

        Helpful (0)
      • October 29, 2019

        5 2018 EcoBoost - LinnieFairbanks Installation Time: Afternoon


        A little hard to install. Bull all prefab stuff is.

        Helpful (0)
      • August 23, 2019

        3 2018 EcoBoost - CrisS Installation Time: Less than 1 Hour

        Quarter louver

        Delivery box was already opened. Louvers look great and provide a clean look. The forward corners of each louver were not flush onto the quarter window but the provided mounting tape seems to be holding it down so far but I do anticipate needing to reinstall with new mounting tape. (2 weeks since install)

        Helpful (1)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Passenger Side - Quarter Window Louver
      • (1) Driver Side - Quarter Window Louver
      • (1) Roll of Automotive Bonding Tape

      Will It Fit My Mustang

      • Bullitt - 19, 20
      • EcoBoost - 15, 16, 17, 18, 19, 20
      • GT - 15, 16, 17, 18, 19, 20
      • GT350 - 15, 16, 17, 18, 19, 20
      • GT350R - 15, 16, 17, 18, 19, 20
      • GT500 - 20
      • V6 - 15, 16, 17

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