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SpeedForm GT350R Style Rear Spoiler; Primed (15-23 Mustang Fastback)

Item 393624
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Ship to: Ashburn - 20149
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      Video Review & Installation

      Hey guys, it's Sara with And today, we have a review and install of the SpeedForm GT350R Style Rear Spoiler with a primed finish, fitting your '15 and newer Mustang Fastback. This is perfect for the Mustang owner looking to add some track-inspired style to their Mustang and wants a more budget-friendly rear spoiler option that you can paint to match your Mustang. This pedestal-style rear spoiler features an aggressive design similar to the factory GT350R wing to give your Mustang some track-inspired styling. It features durable ABS construction. And keep in mind, it will show up with a primer finish, but you can paint it to match your Mustang, like this owner did prior to our install.So, as far as price goes, this option comes in at around $350, which is much more budget-friendly than some others of the same style. And for your money, you're getting one of the more aggressive style wings on the market while saving some cash over more pricey options.And as far as the install goes, I'm giving this one a two out of three wrenches on the difficulty meter. It will require drilling for install and can be done within 2 hours. Now, keep in mind, if you do have a factory wing, it will take significantly longer to remove that, and you should keep in mind that this wing will not cover the factory holes.For this install, you will need a drill and a 21/32 drill bit. You'll also need a trim panel or pop clip removal tool. You'll need a sharpie. You may want a center punch. You'll also need a 10-millimeter socket and ratchet or a Philips-head screwdriver. You may also want a stepped drill bit. And if you're removing the factory wing, you may want a rubber disc, as well as some Goo Gone, and you'll also need some painter's tape.So, our car has a factory wing on it. So we're gonna start with the uninstall of this wing. If yours does not come equipped with one, you can skip ahead to the install. The first thing we're gonna do for the uninstall is to grab a pop clip removal tool, and with our trunk popped, remove all the pop clips holding on this cover.At this point, you can remove the cover. Make sure you're removing it around all the points where it's still attached. Tuck that lever through. There's a few rubber grommets up top here. You just have to push it through and pull your cover around, one on each side. And you'll also have to remove it around this cover for your latch. You can slide it off to one side and then work it out around the latch.We're also gonna remove the two rubber grommets on the outside of the deck lid. You can use a pry tool, or you can just do it by hand. Repeat that on the other side. Now we can see the nut that's right behind that rubber grommet. What we're gonna do is, with a 10-millimeter socket, go ahead and remove it. And I'm just gonna use the socket to remove it the rest of the way. Repeat that on the other side. And the reason that we're using the socket here afterwards is so that we can tilt the trunk back a tiny bit, and using the socket, remove this nut.Now we're moving towards the inside of the deck lid, you'll see two more nuts that we have to remove. With your 10-millimeter socket, and we're using a ratchet because it's kind of tight quarters in here, go ahead and get them removed.Now, at this point, we have our trunk closed, and what we're gonna do is remove this wing from the actual deck lid. It is held on there with a lot of double-side adhesive. So, what we're gonna do is, with a trim tool here, and I'm gonna use a rag over top just to save the paint as best as we can, pull up, and, at the same time, prying up with the trim tool. This is a little bit tedious and slow-going...but we can slowly pop it up.Now we're gonna use our trim tool to go underneath the wing and release the adhesive. Again, we're just moving along the wing, prying it up little by little, and we're using the rag to cut down on any scratches. There will also be a few pop clips that will release as you're doing this. You can just keep going down and just try to pry up on the wing evenly to release these. If you need to switch back and forth, you can do so. And if you need to use more than one tool, go ahead.And you can also start at the other corner as well and continue to pry up same as the other side meeting in the middle. And, once all the adhesive is released, go ahead and pull the wing off of the car. And if they didn't come off with the wing, make sure you remove the pop clip at each corner. Now, if you're worried about prying down on your deck lid, you can use a rag there and pop it out. And repeat that on the other side.Now, at this point, there is a lot of rubber adhesive left behind. Now, there's a lot of different ways to get this off. You can go by hand and push it and peel it off. Or if you have a rubber wheel, what we can do is use this to take the majority of it off and then come back in with some Goo Gone. Now, just be careful not to hangout too long if you are gonna use this tool, just enough to get the majority of this off.Now that we have the majority of the adhesive removed, we can go in with a little bit of Goo Gone or adhesive remover over top of that area, and it's gonna make it a lot easier to get the adhesive off. We may have to go back in with our wheel just to get the rest of the big stuff off. This process is sort of rinse and repeat until the entire deck lid is clean. And come back in with your adhesive remover again. And all of that adhesive should be removed.All right. So, now that we have the factory wing removed and our surface free of adhesive and dry, we can start to mark up the holes that we can drill for our new wing. They've included this template with the kit, and what we're gonna do is lay it on the side to mark up our holes. So, I have some blue tape here. This is just the general area where the marks are gonna go. We have our template on the left side. That's what's in the center there. The other side of this template would be the right side. So, we're gonna line it up with the edge of your deck lid. We're gonna line up also with the bottom. If you like, you can also tape this down. And I highly recommend checking fitment of the actual wing as well before you drill. Once you're happy with this template placement, we're gonna grab a sharpie and mark our hole. And then we can remove the template.Now, one of these holes is actually over one of the factory openings. So, we will not need to drill that one out. And now we're gonna mark these holes with a center punch to help our drill bit center exactly where we want it.Next up, we checked fitment with the wing, and I just slightly adjusted the location of these two holes based on the original marks that we made. So we're gonna take this center punch, and we're gonna mark those as well. And again, this center punch is optional, but it's definitely helpful.Now, what we're gonna do is drill a pilot hole. They recommend a 21/64 drill bit. Obviously, we have a smaller one there. So, we're gonna drill this one first, and then we'll drill our larger hole later. Repeat that with your other holes. And now with the 21/64 drill bit, drill them out larger.Next up, we're on the other side of our deck lid. We can mount up these wing mounts right on the outside here. But before we do that, we're gonna install this bit of felt just to protect your deck lid itself. Just peel back the protective layer on the double side adhesive. Line it up, and make sure it's around the openings and it's not blocking any of the bolt holes. And then go ahead and stick it down.Now, what we're gonna do is mount this wing mount up. We're just gonna start by threading the bolts in. We're not actually going to tighten them down yet until each one is installed, just to ensure that everything lines up properly. Now, we're using a long 10-millimeter socket for this inside one just because we have to go through the double side layer of the trunk. And repeat that for the lowest mounting point. And we did make this hole a little bit larger just on the inside layer so we could fit the socket through there. And now with our 10-millimeter socket, we can tighten this down.Now, we can repeat that on the other side to drill our other three holes. Now, keep in mind, this template will be flipped upside down for the right-hand side. And now that our marks are made, we can center punch and then drill the holes. And now we can drill the holes where we marked them. And now with a larger drill bit, we can drill out the holes. And now, with a step drill bit, we're gonna open this hole up, like I mentioned, on the other side, just enough so we can get a socket in here. Now, this step is optional, but I figured I would show you guys if you'd like to do the same. And make sure you're installing the felt piece on the other side. Again, these are side-specific, so, ensure that you have the proper one.Now we can get the wing bracket installed on the deck lid. Again, we're just gonna loosely install these bolts. And again, we're gonna use the socket in order to get this lined up. Now that we have all four bolts in, I'm gonna start by tightening the one right on the bottom here. Now, I'm gonna use a Philips-head screwdriver to do this just because it doesn't really line up with that socket so nicely, and you can use a Philips on this. And for the rest of them, we're using a 10-millimeter socket.Now, at this point, we're gonna bolt up the wing to the brackets that we already installed. I have one bolt inside each of these holes here. What I'm gonna do is line it up to the wing, and go ahead and tighten it down using a Philips-head screwdriver on these. And, if for some reason it's not lining up, you can loosen up those bolts that we previously tightened just to get your wing in place. Repeat that on the other side.Now, once everything is tight, you can install these covers for the bottom of the wing. They just cover up those bolts that bolt the wing to those painted brackets. Now, because ours is painted, they're a little bit tight. So, just keep that in mind. Now that we have both plugs installed on each side, we're gonna reinstall this trunk liner. Now, you can go around this plastic piece, or you can pop it off. Make sure you have the emergency latch through this felt piece, and start to work around these rubber grommets. If you took the latch cover off, pop it back on. Now we can reinstall the pop clips. And you can also reinstall the rubber grommets.All right. So that is gonna do it for the review and install of this spoiler. And remember, for all things Mustang, keep it at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features & Specs

      • GT350R Pedestal Style Rear Spoiler
      • Aggressive Appearance Upgrade
      • Durable, Lightweight ABS Construction
      • Drilling Required for Installation
      • Ships Unpainted - Primed
      • Fits All 2015-2023 Fastback Mustangs


      Shelby GT350R Styling. Add the aggressive track appeal of the mighty Shelby GT350R to your very own Fastback Pony with this great looking GT350R Pedestal Style Rear Spoiler from SpeedForm. This GT350R Style Spoiler not only enhances the appearance of your S550 Mustang, but it will also enhance its aerodynamics as well. SpeedForm's GT350R Style Spoiler will be sure to set your Pony apart from the rest of the herd.

      Superior Quality. Manufactured from blow molded acrylonitrile butadiene styrene (ABS) material, this GT350R Style Rear Spoiler was made to OEM specifications for a perfect fit. ABS is an extremely strong material known for its light-weight, superior durability and impact resistance. Unlike some other rear wing options on the market, this GT350R Spoiler won't chip or crack like fiberglass and will last for many years to come.

      Drilling Required. This GT350R Style Spoiler will require some drilling for installation, templates are included to help find the proper locations. All necessary hardware is also included to complete this rear end upgrade. If your Mustang is equipped with a factory spoiler, the original holes will be exposed after installing this GT350R Wing.

      Application. This SpeedForm GT350R Style Rear Spoiler is designed to fit all 2015-2023 Fastback Mustangs including the V6, EcoBoost, GT and GT350 models. It is not compatible with Convertible models.

      Technical Notes. This rear deck lid spoiler ships unpainted. AmericanMuscle recommends professional installation of all body parts. We also recommend test fitting these products before they are painted.




      SpeedForm 393624

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Rear Wing Spoiler
      • Mounting Hardware


      Customer Reviews (63)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 19, 20
        • EcoBoost - 15, 16, 17, 18, 19, 20, 21, 22, 23
        • GT - 15, 16, 17, 18, 19, 20, 21, 22, 23
        • GT350 - 15, 16, 17, 18, 19, 20
        • GT350R - 15, 16, 17, 18, 19, 20
        • GT500 - 20, 21, 22
        • Mach 1 - 21, 22, 23
        • V6 - 15, 16, 17

        This GT350R Style Rear Spoiler fits Fastback models only.