Roush Rear Side Splitter Black Textured Pair 2013-2014

100% of 100


  • TPO Plastic Construction
  • Black Textured OEM Finish
  • Sold As A Pair
  • Made In The USA
MSRP $141.99
You save $2.00

Pair of Roush Black Textured Rear Side Splitters for all 2013-2014 Mustangs.

Add true race-inspired styling with this pair of Roush Black Textured Rear Side Splitters for your 2013-2014 Mustang. This kit includes side splitters for both the left and right sides of your rear bumper to create a much more aggressive style!

Features and Benefits of the Rousch Black Textured Rear Side Splitters 421405:
- Adds True Race-Inspired Styling
- Attaches to Bottom of Stock Rear Bumper
- Made from High-Strength TPO (Thermal Plastic Olefin)
- Black Textured OEM Finish
- Includes ALL Necessary Hardware
- Quick and Easy Installation
- Made in the USA
- Sold as a Pair

Constructed from high-strength TPO (thermal plastic olefin) for long lasting durability and made in the USA at Roush's own plastics manufacturing facility, the plastic is molded with high-pressure injection using the same process used by the automotive manufacturers. A perfect compliment for Roush's Side Skirts/Splitters (Part # 420092), installation will take only minutes and there is no trimming or permanent modifications needed. These side splitters come unpainted and feature a black textured finish that will be more resistant to impact from rocks while driving.

*NOT compatible with aftermarket rear bumpers.

How well do you want your Mustang to look and perform? With any of the parts from Roush Performance, you can give it a major performance overhaul, and add some visual styling that will make your Mustang stand apart from the crowd. CJ Pony Parts is a Roush Top 10 Dealer and has over 100 parts from Roush Performance for many different years of Mustang, many of which are in stock and ready to ship right away.

Order this pair of Roush's 421405 Black Textured Rear Side Splitters for your 2013-2014 Mustang from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Difficulty


Novice skill is required for this installation.

Installation Videos

Video Transcript

Today we're going to install this Roush Rocker Splitter Kit, as well as their Rear Splitter Kit on our 2013 Gotta Have It Street car. The splitter kits are designed to match the front spoiler we already installed on the car and carry the theme down the side of the car just like the 427R and other special edition Roush Mustangs.

The rocker splitters are going to mount to your factory rocker moldings using these extensions and the Roush supplied push pins, as well as five additional holes we'll have to drill and tape to make sure your splitters don't go anywhere. The rear splitter is going to mount underneath the ends of your back bumper. They do require drilling for installation. Roush provides a template, as well as hardware and double stick tape to hold them on.

For this installation you'll need a jack and jack stands or lift, needle nose pliers, 1/4-inch ratchet, 7 mm socket, scissors, tape, drill, 1/8-inch pilot bit, 1/4-inch drill bit, rubbing alcohol, and safety glasses. Once you have your car off the ground your first step is going to be to remove the factory push pins holding on your factory rocker panel. You're not going to use them with the new pieces. The rocker will stay in place by the screws on the ends.

Now we're going to prepare our new rocker splitter for installation. The first thing you want to do is bend all these tape tabs over toward the edge. That way once you have it in place and held in place by the push pins you can slide that off and stick it to your rocker. Roush provides new push pins for installation. You don't want to push them in all the way yet. Leave about an eighth of an inch gap so you can remove the tape once it's in place.

When you line up the tabs, we're going to start with the one in the center and then move onto the two ends to hold it in place. Remember don't put them all the way in, leave a little bit of a gap. Now we're going to remove our tape. You want to make sure you slide the splitter as far back as you can on the studs before you pull the tape off. Now that we have it adhered to our rocker we're going to make all our push pins tight. It might be easier to use a screwdriver so you can get up there and put good force on the center.

Once you've installed all your pushpins in the factory locations, the Roush splitters have five additional holes that have to be drilled for additional support. We're going to put some tape about an inch down in your drill bit to use as a stop when you drill. Once you finish drilling your holes you can install your last five push pins.

Now that we're finished with our rocker splitter kit we're going to move on to the rear splitters. The rear splitters don't use any factory hardware, but require holes to be drilled in the bottom of our bumper cover. Roush supplies a template to tell you where to drill your holes.

You want to tape your template in place. It folds in front to follow the inside body line right here lining up with the factory hole in the back here. Once you have it in place, you can drill pilot holes in the center of each bulls-eye. Once you drill those, you can remove your template.

You want to save your template to use on the other side. Now we're going to open our holes up to the proper quarter inch diameter. Now we're going to install the supplied J-clip fasteners. Make sure the threaded stud is pointing up and slide her over the hole.

Now we're going to prep the splitter for installation. It comes with 3M tape. We're going to take the white backing off to prepare them to go onto the panel. Before we put them we're going to apply the supplied adhesion promoter. Just put it on the edge from the holes back. You don't want to put it all over the entire panel. Put the 3M tape on between the holes. In this case we are going to remove the tape first, then our panel is ready to install.

Now we're going to install the bolts to hold it in place. You don't want to tighten them all up yet, just enough to keep it hanging in place before you push up on the tape. Once you have them in place you push up on the panel, stick it into place with the adhesive, and then tighten down the bolts, and our installation is finished.

Now that we have our car back on the ground you can see how well our new rocker and rear spitter work with our previously installed Roush front splitter. It gives our lowered Mustang an even more aggressive look. The rocker splitters should take you no more than about an hour to install and figure about the same amount of time to do the rear splitters. You'll be back on the road in no time.

Vehicle Fitment

This product will fit the following Mustang years:

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