(approx) 2 Hours
Light to Moderate mechanical skill required.
$279.99 (each)FREE Shipping
Hey guys, Justin with AmericanMuscle.com here, with my detailed review of the RTR Rear Valance Diffuser, fitting your premium package 2015 and up Mustang. So, who is this rear valance going to be for? Well, I would say it's going to be for anyone out there who really enjoys what Vaughn and his team at RTR have done with the S550, in regards to overall styling, and maybe wants to emulate that on his or her own ride. In addition, I'd say it's an excellent option if you're like me and you really didn't enjoy the factory color-matched rear valance, and want to replace it with something that's going to be a little bit more aggressive. Now when talking with Vaughn directly about his inspiration for the new RTR Mustang, he made it very clear to me that he wanted to do something pretty crazy with the rear of the car and give it more of an exotic look, in his own words. So by going with this fin-style rear diffuser valance, he definitely accomplished that and gave it more of a race car-inspired look in the rear. Now I think personally this thing looks a lot better when paired with the RTR rocker splitters, but again that is up to you, as it is going to add roughly 300 bucks to the final price tag. On the topic of price guys, this thing is definitely going to come in at the top of the food chain in regards to rear diffusers. Here on the site, it will be nearly double the price of the Roush rear valance, however you have to keep in mind that Roush rear valance can only be used with a quad-tip exhaust setup, so you have to factor that into the price. On the other hand, the RTR rear diffuser here can be used with your factory or aftermarket single-tip exhaust system, so you don't have to worry about anything there. Breaking down some of the finer details here, guys, you will find a durable, injection-molded ABS plastic for the build, and it has been finished off in the same textured grain black plastic as the rest of the exterior plastic on your S550, such as the chin spoiler, lower rockers, things like that. I do want to remind you, this will only work on premium package rear bumpers, as they are a little different from some of the base cars, so definitely don't forget about that. And also keep in mind, this thing will work with factory backup sensors, should not interfere with their operation whatsoever. When it comes time to get dirty, guys, here's what you need to know. Now, there is some permanent modification needed to get this thing installed. Basically you're going to be cutting off that color-match portion of the factory valance and replacing it with the RTR unit here. So an air saw, Dremel, something similar is going to be your best friend here. You're definitely going to need a 7-millimeter socket, along with a panel removal tool. Now, it probably sounds a lot more complicated than it really is, but nevertheless since there is some cutting involved, I'll call it two out of three wrenches on the difficulty meter, and maybe a couple of hours from start to finish to get this thing installed. So to wrap up, the RTR rear diffuser, or rear valance, guys, I really like what this thing does to the rear of the car. My one major pet peeve with the S550 from an appearance standpoint when it was released, was that color-matched factory valance. This thing totally replaces that, fixes that, in my opinion, and adds some aggressive styling to boot. So be sure to check out more from RTR for your S550 here at AmericanMuscle.com.
Subscribe to our YouTube Channel
Features, Description, Reviews, Q&A, Specs & Installation
Fitment: 2015 2016 2017 Details
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
January 03, 2020
Easy install. Didn't take long at all. The worst part of it is permanently cut off a piece of your bumper. painful to watch. The only thing i would say was it pokes out of the car a little more than i expected. But overall very happy with the look and fit of this.Helpful (0)
December 19, 2019
Way better than stock
I hated the car color underneath the car, the black looks tougher and gives it more character. Took about hour and a half to install, not too bad.Helpful (0)
November 12, 2019
PITA Install but good looking
Install was going well as far as unscrewing some of bolts and push clips. However, when I ran into unclipping the original diffuser, all frustration kicked in. You quickly realize why they suggest removing the bumper. The clips wouldn't be as hard to get off if you were standing up and had good leverage, but being underneath the car trying to slide and pry the clips off; quickly became a daunting task. Having a second pair of hands definitely helps if you intend on keeping the bumper on.Helpful (0)
September 12, 2019
Rtr rear diffuser looks AGGRESSIVE
Awesome look to make the rear end more aggressive. I highly recommend to buy this along with the Raxiom revser light/running light. It's the perfect combo.Helpful (1)
May 01, 2019
Relatively easy install (highly recommend buying a Dremel for this), and definitely worth the effort. Looks great and makes the rear so much more aggressive.Helpful (0)
April 03, 2019
Fit n finish looks factory. Love the new styling, and installed just as advertised.Helpful (0)
March 18, 2019
Most aggressive feel!
When I installed my RTR rear diffuser it was exactly what I needed to toughen up the look of my rear end. Just about all my mods are RTR so I am very loyal to an amazing brand. Install was fairly simple, little scary cutting into the rear bumper but doing so was a lot easier than it sounded. The only annoying part was trying to clip in the new rear diffuser with the stock one. The clips were stiff and required a bit of muscle to get them in, but they will eventually pop into place. 10/10 would recommendHelpful (1)
February 08, 2019
RTR rear diffuser
This diffuser looks great fit and finish perfect easy installHelpful (2)
February 01, 2019
OEM grade in fitment and finish. Completed satisfied with how this diffuser makes the rear of the car look like how it should have come from the factory. The only thing that was tricky was getting all the factory clips to release to remove and install the new diffuser, which made the install time a bit longer than it really should have been.Helpful (2)
December 18, 2018
RTR rear diffuser
This make the back of my Mustang look more aggressive and a way better style. I’m really impress with this product. The fitting and installation is great.Helpful (3)
Will this diffuser fit with a quad tip exhaust?
The RTR Rear Diffuser, is not designed for a quad tip exhaust and would require modification.
hi! may i know the box dimensions weight of this product? its for shipping purposes. thanks
Packaged weight is 5 lbs. Dimensions are: 44" L x 14.25" W x 5.25" H.
hi! may i know the box dimensions the weight for shipping purposes? thanks
The packaging occasionally changes over time for various reasons, so your best bet if you ever need these dimensions would be to contact our customer service team to make sure you are getting the most up-to-date answer.
I was Q and received no answer. So is there any rear diffuser's that will be offered in the future for the base model bumper?
At this time, we are unaware of any models in the works for base model bumpers.
It says this will fit Trim Levels: 200A/201A/400A/401A. Where can I look to see if I have one of these?
You can check in the owners manual or call a Ford Dealership.
This RTR Rear Diffuser is specifically designed to fit 2015-2017 GT and EcoBoost Mustangs equipped with the factory Premium Chassis Packages only (Trim Levels: 200A/201A/400A/401A). To help clarify which package the 50th Anniversary has, it should be listed on the window sticker.
You will need to remove the factory trim, tabs, and light from the bumper, for further review we have the install guide linked here:https://www.americanmuscle.com/rtr-rear-diffuser-1516-manu-install.html
This rear diffuser is designed to fit the 15-17 GT and EcoBoost Premium models only. Unfortunately it will not fit a base V6 model.
The RTR Rear Diffuser has not yet been tested on 2018 Models. This only fits vehicles with the Premium chassis package, Trim Levels: 200A/201A/400A/401A
This RTR Rear Diffuser will fit on Mustangs with trim levels: 200A/201A/400A/401A. If your performance package has one of those trim levels, it will work.
This RTR Rear Diffuser is specifically designed to fit 2015 to 2017 GT and EcoBoost Mustangs equipped with the factory Premium Chassis Packages only.
This RTR Rear Diffuser does require some light trimming of the factory bumper. Attached below is an installation guide that shows exactly what needs to be trimmed. https://www.americanmuscle.com/rtr-rear-diffuser-1516-manu-install.html
At this time the RTR Rear Diffuser is only made for the premium bumpers. We have not heard word from RTR of any development for non premium bumpers.
The RTR Rear Diffuser is not designed to clear tow hitches.
You can get in contact with your Ford dealership and give them your VIN number. They will be able to tell you exactly what package is on your car.
(approx) 2 Hours
Light to Moderate mechanical skill required.
What's in the Box
Fits Premium Chassis Packages only (Trim Levels: 200A/201A/400A/401A)