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Ford GT500/CS/BOSS 302 Rear Diffuser (10-12 All)

Item 53675
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      Review & Installation Video

      Hey, guys. Adam here with Today, I'm bringing you a detailed overview and installation of the Ford GT500/CS/BOSS 302 Rear Diffuser, available for all 2010 to 2012 Mustangs. So in this video, I'll be going over the styling and appearance you can expect from this particular rear diffuser directly from Ford as well as the materials and construction. I'll top the video off with the installation, letting you know upfront it will get a one out of three wrenches on our difficulty meter, meaning it does not require any cutting, trimming, or drilling to get this installed.The Ford GT500/CS/BOSS Rear Diffuser you see here today will be for any '10 to '12 Mustang owner looking to switch up the rear end look of their own S197 to be similar to the styling of the Ford GT500, California Special, and Boss 302 models. Now, this is gonna be geared for the guys out there looking to switch up the design, but not really aiming for an aftermarket look, but wanna keep it in the Ford family with a true Ford OEM part directly from their own warehouse. Now, typically, with something like this from Ford, you'd expect a pretty high price tag, but actually, this one's gonna be more on the affordable, compared to some of the other aftermarket options, coming in right around the $160 mark. Now, if you are someone looking for a more race-inspired design, there are plenty of different options out there from very different manufacturers to give you that aftermarket look, but this one's gonna stay true to the Ford family.This is literally going to be a direct-fit replacement coming from the Ford warehouse, and it's something you would've seen on the '10 to '12 Shelbys, California Specials, or Boss 302s, which all share the exact same rear diffuser design, the one you see on the table today. Since it is a direct-fit replacement from Ford, it does not require any drilling, cutting, or permanent modification to get installed. It'll be a direct bolt-on install. Now, after all, this is something that is gonna be a perfect accident repair. If you need a rear diffuser and you're looking to pick up an upgraded styling, this is a great way to go, or for the guys out there looking to pick up a more aggressive design.So as you can see, this one is a little bit larger and wider than the factory option that came on your GT or V6, and it does come with a matte-black finish and a textured design here just to give it a little bit more detail and, of course, rock resistance and impact resistance. Underneath here, you get a fin styling right under the license plate, between the two tailpipes, which actually might appear to be a separate piece, but it is all one connected continuous piece that, in my opinion, really flows with the lines of the body style. And since it did come on those Shelby and other models I mentioned earlier, you would expect it to look like it came from the factory. Since it is coming directly from Ford, expect really high-quality, pressure-injected thermoplastic, which is impact-resistant and long-lasting, just everything you'd expect from the Ford warehouse. So you don't have to worry about sacrificing quality with this.Because it has such a high-quality material and because it's coming directly from Ford, I'd expect it to typically have a pretty high price tag. Fortunately, that's not the case with this option. It comes in right around the $160 mark, which is more affordable than a lot of the aftermarket options with lesser-quality materials. Now, because of that, I would typically recommend this one for anybody looking to pick up a new rear diffuser, because you've got an upgraded styling, which, in my opinion, is more aggressive, doesn't require any extra work as far as install is concerned. So if you're in need of one, in my opinion, this is a perfect fit.As far as that install is concerned, you wanna have simple hand tools on deck, like a ratchet, socket set, Phillips-head screwdriver, flat-head screwdriver, pliers, very simple hand tools such as those. And of course, two to three hours at the most on the install time, and it definitely gets a one out of three wrenches on our difficulty meter. To kick things off, you will have to remove parts of the rear bumper. Now, pop open the trunk. You'll have to push away some of that trunk liner to gain access to a couple of push pins as well as the trunk light harness, which you'll have to disconnect. You'll also have to disconnect your tail light harnesses and remove those as well to gain access to the some of the things you need. The whole bumper should come off with the removal of a couple of screws inside the wheel wells of the rear. In addition to that, there's a couple of clips inside as well that'll help things come off a lot easier. Once you have the bumper completely off, you'll have to remove a couple of the wiring harness from inside. Now, that step isn't exactly required, but it is recommended to make things easier on you in the long run. From here, installing the diffuser after removing the factory option is extremely simple. It's just a matter of push pins that go all the way around the edges of the diffuser from the Ford factory. From there, just put everything back together in the reverse order you took it off in, and then you're good to go.One thing I will mention here is your backup sensors. If your Mustang is equipped with those, you will have to drill holes to make those work if you do have them equipped. If you're okay losing those and you don't wanna make any drilling or modifications, then, of course, you can skip that step. But if you'd like to make those work, the drilling holes will be necessary, in which case the installation instructions, which will detail everything I just mentioned and help you along your way, will also help you with that step as well. Overall, everything should take about two to three hours at the absolute maximum, and, again, a one out of three wrenches on our difficulty meter.Just to wrap it up, if you're the owner of a '10 to '12 Mustang, you might be looking for a way to swap out your rear diffuser to get something a bit more aggressive, while sticking to the Ford family options without going to an aftermarket design. If that sounds like you, you might wanna check out the Ford GT500/California Special/Boss 302 Rear Diffuser, available right here at

      Product Information

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


      • Shelby GT500/Boss Styling
      • Genuine Ford Part
      • Features Grained Texture
      • OEM-Quality Plastic Material
      • OEM Fit and Finish
      • Fits 2010 to 2012 Mustangs


      Shelby GT500 Styling. This Lower Rear Valance (a.k.a. Diffuser) is the exact same one that is featured on the Shelby GT500, California Special and Boss Mustangs. Offering aggressive race inspired styling this rear diffuser makes the perfect replacement part or appearance upgrade for your Mustang.

      Quality Construction. Made from OEM quality high pressure injection molded thermal plastic for it's long lasting durability, this rear diffuser features an OEM grained texture to increase longevity against rock impacts from daily driving.

      Application. This Rear Diffuser is a direct fit replacement for the 2010 to 2012 Shelby GT500, California Special and Boss Mustangs, and can be installed to upgrade the appearance of the V6 and GT models.

      Shipping Note: This product can not be shipped to an APO/FPO, Guam, Hawaii, Puerto Rico, Alaska, the US Virgin Islands or Canada addresses.

      Freight Notes. Freight items can only be shipped within the continental 48 states, no expedited methods. What is freight shipping? Your Answers are Right Here!.

      Fitment: 2010 2011 2012 Details

      Ford AR3Z-17F828-AA

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • March 24, 2020

        5 2012 GT - WilliamWeikert

        GT500/CS/Boss Rear Diffuser

        fits and looks good but my 2012 GT has the back up sensors and the GT500/CS/Boss Rear Diffuser has no drill lines to show where to drill and did not come with a template

        Helpful (3)
      • March 15, 2020

        5 2011 GT - Wheels2011 Installation Time: Afternoon

        Great Replacement!

        Replaced the stock rear valance on my car, great fit and look!

        Helpful (3)
      • January 24, 2020

        5 2010 V6 - Captive11 Installation Time: Shop Install Installation Cost: 0-$100

        Mean look

        Aggressive look. Way better look than the stock diffuser. Dual exhaust

        Helpful (3)
      • January 23, 2020

        5 2012 GT - TomT Installation Time: Shop Install

        Ford GT500/CS/BOSS Rear Diffuser (10-12 All)

        Excellent quality and shipped quickly. I would recommend this part to anyone.

        Helpful (3)
      • June 16, 2019

        5 2011 GT - Taj Installation Time: Afternoon

        Took some time

        Took a while have to kinda take the bumper off. But it looks nice

        Helpful (3)
      • April 11, 2019

        5 2012 GT - Jesus Installation Time: Less than 1 Hour

        Rear diffuser

        Beautiful addition to my car fast shipping! Very great price.

        Helpful (3)
      • March 22, 2019

        4 2012 V6 - Trent Installation Time: Afternoon

        Excellent addition

        I just had to have this! Very easy install, a buddy and i did it in about 2 hours. An vast improvement over my stock v6 one!

        Helpful (3)
      • March 14, 2019

        5 2012 GT - Destry Installation Time: Afternoon

        Good look

        expect to spend about 2 hours for replacing but its worth it.

        Helpful (3)
      • January 25, 2019

        5 2012 V6 - MartinV Installation Time: Weekend

        Perfect fitment

        Gives it an aggressive look compared to stock. Straight forward on to installling.

        Helpful (4)
      • January 13, 2019

        5 2010 V6 - JohnnyG Installation Time: Afternoon

        V6 Single to Dual

        The Bumper fit like a glove, did have to make a few stop to get some screws though.

        Helpful (5)

      Questions & Answers (28 answers)

      5 Top Rated Questions

      Does this fit on a 2013 GT? I want to add this to my new 2013 GT. WIll this fit, (does the 2013 have the same dims as the 2012 rear end) or am I going to have to wait for the Spring of 2013 to get a properly matched product?

      • You'll have to wait for the proper product unfortunately. There were many changes made between '12 and '13. The appropriate product for your car will be out soon enough, so I'd just wait it out.

      Helpful (3) Show 4 more answers

      Can this retain the factory rear backup sensors?

      • This does not have provisions to retain the backup sensors. Retaining the sensors will require fabrication. 

      Helpful (2)

      Does this fit the Roush square tips?

      • This diffuser will not fit the Roush square tips

      Helpful (0)

      Will quad tips fit or does it have to be cut wider?

      • Unfortunately quad tips exhausts will not work with this diffuser.

      Helpful (0)

      Can the diffuser be removed from the valance or is it all one piece?

      • This will be all one piece.

      Helpful (0)
      10 More Questions
      Does this product come with a finished paint ,if so what kind. And or would it be unpainted black ? 1 answer
      If I,buy the Ford GT500/CS/Boss Rear Diffuser and RTR three piece Splitters together,will they fit together under my 2012 Mustang GT? 1 answer
      Can this be easily mounted and the stock removed without a lift? 1 answer
      How do I get the 4 tabs below the license plate to get seated correctly? I noticed that they weren't all the way in after I put the bumper back on the car. They won't go in no matter how match I push on the diffuser. 1 answer
      will this product fit my 2012 3.7 v6, base convertible, with dual axel back exhaust? 1 answer
      will this product fit my 2012 v6 3.7, base convertible. 1 answer
      Is it directly replacement rear bumper valance for 2010 mustang v6? 1 answer
      I did a quad pipe style on my 2010gt, will this fit since I have a quad tip? 1 answer
      Is there anyway i can transfer my factory rear parking sensors over to this? 1 answer
      will it fit a 2012 gt convertible 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Rear Diffuser

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12
      • GT - 10, 11, 12
      • GT500 - 10, 11, 12
      • V6 - 10, 11, 12

      V6 Mustangs require a dual catback exhaust system