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SpeedForm 2019 GT350 Style Rear Spoiler; Shadow Black (15-23 Mustang)

Item 408139-G1
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Ship to: Ashburn - 20149
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      Video Review & Installation

      Justin: The pre-painted GT350 Style Spoiler from SpeedForm is a really sharp option for the 2015 and newer Fastback owners out there who might be looking to recreate that modern Shelby Swing styling, while also enjoying some of the benefits of a pre-painted part. Now, the SpeedForm spoiler is packing that automotive-grade ABS plastic build throughout, and does include everything needed for the installation, all for that high $300 price point. So, even though the SpeedForm spoiler here is called the GT350 Style Spoiler, the reality is it can be found both on the newer GT350, along with that bad-ass GT500, where Ford affectionately refers to this thing as the "Swing." Part spoiler, part wing, and 100% awesome. Now, in my opinion, guys, this is easily one of the best-looking factory-produced spoilers in a long time on a Mustang, and in fact, I still remember seeing this for the very first time when we were in Detroit with the video team, shooting a media drive for the 2019 GT350, and just commenting on how huge the aftermarket response will be for this particular swing. And sure enough, judging by the overwhelming number of positive reviews back on the customer-submitted images and review page, I'm certainly not that far off.But this thing is more than just a pretty face, right? Ford's OE version of the Swing was able to produce 135 pounds of downforce at 120 miles an hour, without the optional handling pack Gurney flap that basically just added a bit more meat to the back portion of the spoiler. And while yes, this option, I would say, is going to be an appearance mod first, I would also assume some of those downforce benefits would also carry over to the SpeedForm option that we're talking about here today. Again, this thing has been made from that durable automotive-grade ABS plastic, and has been built and designed using OEM Ford CAD data, which is basically gonna result in a near-perfect fit for any S550 Fastback at home.Now, the site does say this will not work on convertible S550 cars out there without modification. Yes, I've seen some drop-top S550 owners comment in the review section that they have made this thing work, but just know it does take some additional modification, and will not be a 100% bolt-on part. Last but not least, one of the best things about the SpeedForm here, besides that radical styling, is the fact that this thing is available pre-painted, ready to match your ride right out of the box. Now there's no waiting for parts at the paint shop, only to hope they match your ride once you pick them up. Instead, SpeedForm is gonna spray your spoiler or swing here with the same base and clearcoat that Ford uses on their Mustangs, so you can expect a near-perfect color match right out of the box.But now we wanna segue into the install, and the site is gonna call this a middle-of-the-road two out of three wrenches on the difficulty meter, and at least a couple of hours or so to complete from start to finish. I will say, one of the most time-consuming parts about this install will be removing that factory adhesive from your factory spoiler, if your car is equipped. But, nevertheless, to give you a better idea of just how this will go down on your S550 at home, here's an AM customer to walk you through the job right now.Man: Here are all the tools you will need for this install. First, you're gonna need a 10-millimeter socket wrench. I used a magnetic bit that I just got on Amazon. I would highly recommend getting this, so you don't drop the bolts into the trunk. I also used my own M6 hex bolt. These are M6 by 18, with a washer. Next, I used these plastic scraper tools to remove the deck lid from the trunk. You can get these at, like, Harbor Freight. They're super cheap. I also used this one to pry off the plastic pins on the tool in the liner. Next, I used a microfiber towel, along with these scraper tools, so I didn't scratch the trunk. And then, these are the homemade blocks I used to keep a spacer in between the trunk and the adhesive on the spoiler while I got the bolts in. They're just little one-by-two blocks of wood wrapped in paper towels, so I don't scratch the paint. And I used masking tape to tape those down. I also used Goo Gone to get the old adhesive off, and then, lastly, I used alcohol prep wipes to wipe down the trunk before I put on the new spoiler.The first thing we gotta do is we gotta take off the factory deck lid. And to do that, you're gonna have to take this liner off and to be able to get to these four bolts, you have to take these... These just kind of pop off. [inaudible 00:05:03] those two, and then you unscrew these. Then pull this off. You wanna be careful, but it does kind of take a little bit of force. Pop that off. And then, I'm gonna use this plastic panel removal tool to pry each one of these little pins out. And these should just pop right out. You wanna be careful not to break them. You could probably also do this with a flathead screwdriver.So now, thread this back through, and the liner is removed. Next, you're gonna wanna take a 10-millimeter socket, and come take out these two bolts inside here. You wanna be careful not to drop them into the trunk panel, because it'll rattle around in here and be a pain to get out. So, I'm gonna go ahead and loosen these, almost all the way. And then once they get close, gonna do the rest by hand, to make sure not to drop them. That's one. And then, we're gonna need to take out these. And same thing, be careful you don't drop them in. For this, I'm gonna be using a magnetic 10-millimeter socket bit, to try to keep it from falling through the trunk.Another trick you can do is when it's getting close, you can put this down a little bit, [inaudible 00:07:26] Gonna do the rest by hand. You wanna be very careful. Like that. And then you're gonna wanna do the same thing on the other side over here. Do the rest by hand. And just like that, all four bolts are out.Once you have all four bolts out, then you're gonna wanna get a plastic scraper tool, and separate the adhesive from the spoiler in the trunk. I'm also gonna be using a microfiber towel, to avoid scratching the paint. You wanna come in here and separate the adhesive. You'll be able to feel it. You can use a heat gun or a hair dryer, but it's pretty hot here, so mine's already pretty loose. You can just work your way around, and you'll feel once you get through it. And just take your time not to scratch or pull up on the spoiler, so you don't damage or dent your trunk. Work your way all the way around. And then, use the towel, and [inaudible 00:09:06] on the inside. Same thing.Once you get that, should be able to gently lift up. It should pop off. So, then once you have that off, you'll see there's a lot of adhesive stuck on here. You're gonna wanna scrape and clean all this off, so that this is a fresh surface to put the new spoiler on. So, I'm gonna go ahead and do that now.So, now, I've cleaned off the entire top part of the trunk. Got all the adhesive off, so it's a nice, clean surface. These blocks you see here, I hand made, because there are no alignment posts on the new spoiler, like the original deck lid, so it's gonna be a little tricky to line up the holes before you put the adhesive down. So, what these blocks do is they're just resting on the trunk. They leave a gap from the adhesive in the trunk, so that it doesn't get stuck down, and then that way, I can go ahead in with the bolts, and tighten them just a little bit, to get it started, so I know it's lined up. Then I'm gonna take these blocks out and press the adhesive onto the trunk, and then fully tighten the bolts.So, now, you're gonna wanna take off all the backing on the adhesive on the other side of the spoiler, and rest it on these blocks. And I'm using my own hex bolts. They're M6 by 40. These are just so I can use my magnetic socket bit, so I know I won't be able to drop it into the trunk. And also, these are a little bit longer, so that, with that gap the block creates, I can still line these up and get enough thread in, so I know they're lined up. You can still use the bolts that came with it. It'll will work just fine. And then, also, once I get it lined up, and I get the adhesive stuck on, I'm gonna be swapping these out for M6 by 18, with washers, and those will be the final bolts that hold on the spoiler.So, I already have the outer two ones in. They're lined up, so now I'm gonna go ahead and put the middle two in. And this is where having someone else is gonna come in handy. You can kind of hold everything in alignment. So, gonna carefully put in the two center bolts by hand. But once they're threaded, [inaudible 00:11:57] move to the next one. You wanna still be careful not to drop them. Now that I have all four in, you can go ahead and remove the blocks. And [inaudible 00:12:28] you're gonna wanna carefully lower the spoiler, until [inaudible 00:12:33] Go ahead and push down. [inaudible 00:12:46] it's all lined up. Make sure it sets. And then, now, [inaudible 00:12:58] the spoiler's on there, you can go in, take out the longer bolts, and put in the shorter ones with washers.So, once you have all four bolts in, your spoiler is completely fastened down. We're just gonna do what we did to start, in reverse, to put the trunk liners back on. So, you're gonna wanna feed this back through. Put on this piece. [inaudible 00:13:24] Screw these back in. And put all these plastic push pins back in. And the rubber inserts over the bolts. And this, put this back here. And you're done.Justin: So, wrapping this one up, guys, if you're looking to emulate one of the coolest factory spoilers produced, and take advantage of the convenience of a pre-painted part, then you have to check out SpeedForm's option, right here at

      Product Information

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

      Features & Specs

      • 2019 GT350 Style Rear Spoiler
      • Aggressive Appearance Upgrade
      • Durable, Lightweight ABS Construction
      • Drilling Required for Installation
      • Ships Pre-painted in Shadow Black
      • Fits 2015-2023 Fastback Mustang Models


      2019 GT350 Styling. Add the aggressive styling of the 2019 Shelby GT350 to your very own Fastback Pony with this great looking GT350 Style Rear Spoiler from SpeedForm. This GT350 Style Spoiler not only enhances the appearance of your S550 Mustang, but it will also enhance its aerodynamics as well. This SpeedForm 2019 GT350 Style Spoiler will arrive to your door pre-painted in shadow black ready to be installed.

      Superior Quality. Manufactured from blow molded acrylonitrile butadiene styrene (ABS) material, this GT350 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 GT350 Spoiler won't chip or crack like fiberglass and will last for many years to come.

      Drilling Required. This 2019 GT350 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 GT350 Wing.

      Application. This SpeedForm 2019 GT350 Style Rear Spoiler; Shadow Black is designed to fit 2015-2023 Fastback Mustang models. Not compatible with Convertible models.


      SpeedForm 408139-G1

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • Rear Wing Spoiler
      • Template
      • Mounting Hardware

      Customer Reviews (72)

        Questions & Answers

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