Roush Mustang Rear Valance 421894 (15-17 GT Premium, EcoBoost Premium)

Roush Rear Valance (15-17 GT Premium, EcoBoost Premium)

23 Reviews 15 Answers

Market Price $245.99 You Save 9% ($21.00)

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Item 387054
MPN# 421894

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Features, Video & Details

Formidable Roush R7 Styling
Durable OEM-Quality TPO Material
OEM Style Stippled Grain Texture
Not Prepped for Backup Sensors - No Pre-drilled Holes
Simple Installation
Made in the USA
Designed for Use with Roush Quad Tipped Exhaust Systems
Fits 2015-2017 GT and EcoBoost Mustangs
Designed for Premium Chassis Packages Only (Trim Levels: 200A/201A/400A/401A)

Product Resources

Customer Photos (17) Customer Reviews (23) Questions (16) & Answers (15)

Review & Installation Video

Formidable Roush Styling. Now you can add a formidable new appearance to your S550 Mustang with a Roush Performance R7 Lower Rear Valance. Designed using the original manufacturer CAD data for a perfect fit, this is the same exact rear valance found on the new special edition Roush Mustangs.

Quality Construction. Made in the USA at Roush's own plastics manufacturing facility from OEM quality high pressure injection molded high-strength thermal plastic olefin (TPO) for it's long lasting durability, this rear valance features a stippled grained texture for an OEM look and to increase longevity against rock impacts from daily driving.

Not Prepped for Backup Sensors. This Roush Performance Rear Valance is specifically designed for Mustangs that do not have factory installed back-up sensors. If your Mustang is equipped with back-up sensors please use Roush part# 421919.

Required Upgrade. For proper installation of this Rear Valance you will be required to upgrade to a Roush Quad tipped exhaust system. GT models will need Roush Part# 421920 or 421921, EcoBoost models will need Roush Part# 421922 or 421923.

Application. This Roush Performance Rear Valance 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).

Fitment: 2015 2016 2017 Details

CA Residents: Warning: California's Proposition 65

What's in the Box

(1) Lower Rear Valance

Installation Info

Installation Time: (approx) 3 Hours

Difficulty Level:Light to Moderate mechanical skill required.

Installation Guides:

Manufacturer:
How to Install Roush Rear Valance on your Mustang

Tech Specs

Tech Guides:

Will it fit my Mustang?

EcoBoost - 15, 16, 17
GT - 15, 16, 17

Fits Premium Chassis Packages only (Trim Levels: 200A/201A/400A/401A)

Questions & Answers (16)

5 Top Rated Questions

Will this fit my 2017 v6 ?

Hello, this rear valance will not fit your 2017 V6 Mustang. This part is meant for Ecoboost and GT Premium models with the Premium bumper.

Helpful (2)

What’s the biggest size quad tips that I could run with this valence ?

You can safely run 4" Exhaust tips with this valence.

Helpful (0)

I have a 2016 premium package with the Brembos, dash gauges, bigger wheels and tires. The ad states the two piece “premium pkg” bumper will only work. My question is that since I technically have a premium package but I have a one piece bumper will it work?

The Roush Rear Valance will completely replace the lower section of the two piece bumpers, and will only be compatible with cars equipped with 2 piece bumpers.

Helpful (0)

i have a 2018 ecoboost base package, if i get the roush rear valance and quad tip exhaust, will it fit?

The Roush Rear Valance is designed for direct fitment for Premium Chassis Packages Only (Trim Levels: 200A/201A/400A/401A).

Helpful (0)

I have a base model 2016 GT will this fit ??

This Roush Rear Valance will only work when used with a Premium Rear Bumper and Roush Quad-tipped exhausts.

Helpful (0)

Not finding an answer? Ask your question! Post Your Question

10 More Questions

would this Roush rear valance fit on a 2017 Mustang GT California Special? 1 answer

This Roush Performance Rear Valance is specifically designed to fit 2015-2017 GT and EcoBoost Mustangs equipped with the factory Premium Chassis Packages which should include your California special.

Helpful (0)

Hello! I put a premium bumper with sensors on my base gt, but the sensors are not used. Would I still need to buy the valence with pre drillled sensor holes or could i get the one without holes? 1 answer

If you removed the sensors from that premium bumper, you would be able to use the Roush Rear Valance without the pre-drilled holes. If the sensors are still present but unused, you would need the valance that has the pre-drilled holes which is item number 389792 and can be found here: https://www.americanmuscle.com/roush-rear-valance-2015.html

Helpful (0)

Will this rear valance fit a 2017 gt350? 1 answer

The Roush Rear Valance will not fit the GT350 rear bumpers.

Helpful (0)

Will this rear valance fit a shelby gt350? 1 answer

Unfortunately, this rear valance would not be a good fit on a mustang Shelby gt350.

Helpful (0)

I have a 2017 ecoboost that is NOT premium. From what I gather this will not fit my mustang, but is there a version for just the regular ecoboost? 1 answer

This valance will unfortunately not fit a standard Ecoboost, we apologize. MMD does offer a rear diffuser for non-premium bumpers, item 390517. https://www.americanmuscle.com/mmd-rear-diffuser-1516nonpremium-bumper.html

Helpful (0)

Hi , i own a 2017 coupe premium ecoboost Mustang , i dont have the reverse sensors , will this fit on my car ? I managed to get 380 HP out of my I4 2.3L so far and i need a good flowing exhaust , i`d like the quad tip roush exhaust to go with this. 1 answer

Hello! This rear valence does not have holes in it for the reverse sensors, so this will fit perfectly on your 2017 Ecoboost Mustang Premium.

Helpful (0)

In the video, you talk about getting a different exhaust or muffler... do you have to do that? I have an ecoboost premium with muffler delete and was wondering if I could just buy new tips to give the quad exhaust appearance? Thanks 1 answer

Hello! You would not need to buy new a new muffler. You would just need new quad tips that fit your existing set up.

Helpful (0)

Are the rear side pieces of the rtr side splitters compatible with this valance? 1 answer

The rear side pieces of the RTR side splitters are compatible with this valance.

Helpful (0)

Why is it that it only can be installed on the premium? What piece does the premium have that the base doesn't? Also I have seen that it would be easier to just change the base bumper to the premium but if not are there any modifications that can be done in order to fit it to the base? I know these are many questions but I've been veery curious, I hope I can get an answer. Thanks! 1 answer

The premium bumper has the proper fitment for this rear valance and to make this fit on anything that isn't a premium bumper, you would be subject to modifications. Unfortunately I would be unable to supply you with the modifications necessary to make this work.

Helpful (0)

I want to install this on my base model 5.0 .... do think is it possible with cutting like how we did to 13 14 boss 302 and CS diffusers. 1 answer

Honestly, it would be easier to convert your base bumper to the premium bumper as the valance is specifically designed for the premium (2-piece) bumper since the Roush Valance uses some of the mounting points that was used by the factory valance panel. If you tried to install the valance on a base/non-premium (1-piece) bumper, most luckily you would have to do some modifications to both the valance and bumper (which there is no instructions available for those modifications).

Helpful (0)

People Who Bought This Item Also Bought

Customer Reviews (23) Write a Review

Overall Rating

4.7

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

Fit 4.5 4.5
Appearance 4.8 4.8
Bang For Your Buck 4.6 4.6

no one in the world ever gets what they want, and that is beautiful

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5/5

Installation Time: Afternoon

September 13, 2018

ROUSH QUAD TIP

My local body shop was able to install this Roush on a Non Premium GT. I NOW HAVE QUAD TIP EXHAUST.

RobertI

Year: 2015 Submodel: GT

Helpful (0) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

September 07, 2018

Perfect fit

For anyone looking to step up your pipe game to that quad tip look, this is a perfect fit. Especially if you don't to pay 700 plus bucks for the Gt350 style valance.

RexH

Year: 2015 Submodel: GT

Helpful (0) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
3/5

Installation Time: Full Day

June 14, 2018

It looks good, but the install is awful.

When I received this, I was pumped - it looks great out of the box, the instructions seem good, and I wanted it installed. Well, getting to the point of no return (where you cut your bumper) is fine, but after that, the instructions are garbage. They tell you to put the studs in the wrong boss, and when you try to install it onto the bumper, you can't, because there are standoffs behind the reflectors that hit the bumper. Then, you wrestle it, and the bosses break. Then, there's nothing to stop you from pushing the studs through the plastic and making marks on the outside. I contacted Roush, and they sent me a new center section, and promised to update their documentation and procedures with the correct information, but I have no idea if they did. It looks nice on the car, no doubting that, though because of install issues, it's tough to completely snug it against the bumper cover, so you do get a slight gap in certain places. Install definitely takes a full day, and it's better if you have an extra set of hands.

jacknifetoaswan

Year: 2016 Submodel: GT

Helpful (2) Thanks for your input!
- Fit 2
  2
- Appearance 4
  4
- Bang for your Buck 3
  3
4/5

Installation Time: Afternoon

April 07, 2018

Nice. Allows quad tips.

One of very few options for allowing quad tips for a 15-17 GT. I'm running these with a Corsa Sport quad tip exhaust, and while they don't fit together EXACTLY right, they are close. Had to adjust the exhaust to line up with the pass-through area on the valance. Gives a lower, more agressive look to the rear end. Wish it were a half or maybe 3/4 inch lower, but it's good. The pieces that flow back from the wheel wells are separate, so there is a seam there that isn't there on the stock premium valance, but not a huge deal. Recommended.

MattW

Year: 2017 Submodel: GT

Helpful (2) Thanks for your input!
- Fit 4
  4
- Appearance 4
  4
- Bang for your Buck 4
  4
5/5

Installation Time: Full Day

April 05, 2018

Roush Rear Valance

This product is a must if you really want to get a quad tip exhaust kit. It was about a day for it to get installed. In the long run it was totally worth it.

Henry

Year: 2016 Submodel: EcoBoost

Helpful (2) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

February 09, 2018

Very clean

This balance has completely changed my GT. It was an easy install for someone with skill and only took a couple hours. Impressed with the integrity.

BarryW

Year: 2016 Submodel: GT

Helpful (3) Thanks for your input!
- Fit 4
  4
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

February 08, 2018

Looks Incredible!!

Paired with the Corsa quad tipped exhaust it looks stunning.

ArturoP

Year: 2017 Submodel: GT

Helpful (4) Thanks for your input!
- Fit 4
  4
- Appearance 5
  5
- Bang for your Buck 5
  5
3/5

Installation Time: Afternoon

October 13, 2017

For my roush valance

Complicated for nothing after tight the screw i see little bit hole in the middle bumper and valance the best is sell the complete bumper for little bit more expensive and no big working like this for try to fit good

AnthonyB

Year: 2017 Submodel: GT

Helpful (4) Thanks for your input!
- Fit 3
  3
- Appearance 3
  3
- Bang for your Buck 3
  3
5/5

Installation Time: Afternoon

October 08, 2017

Lengthy install but worth it

If you’re in the market to go quad tip exhaust this is the affordable only option out there. It’s kind of sketchy cutting and drilling into your bumper but it’ll all be covered up once the valence is installed. I found the directions on the Roush website and they are very clear and easy to follow.

JesseO

Year: 2017 Submodel: GT

Helpful (4) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $100-$250

August 30, 2017

Best mods on my car

The Roush rear valance not only cleans up the look of my car, it looks like it came from the factory that way. Great fit, no gaps. Great upgrade for the money.

Jimbob

Year: 2017 Submodel: GT

Helpful (4) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
4/5
August 29, 2017

Will not fit on base GT

Will not fit on base GT, overall American muscle only charged $10 shipping fee which is nice.

HanleyS

Year: 2017 Submodel: GT

Helpful (4) Thanks for your input!
- Fit 3
  3
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

July 21, 2017

The Truth

This came well packaged and shipped super fast. It really changed the appearance of my 2015 Mustang GT. The valance was easy to paint and directions were easy to follow.

hemistar1

Year: 2015 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

June 21, 2017

Roush Rear Valance

Fit and finish is top quality. Install wasn't too bad, but make sure you have the template lined up as perfectly as possible. Once you have the holes drilled, it's smooth sailing. An extra set of hands will come in handy.

ponie1992

Year: 2016 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

May 09, 2017

Overkill, but that's not a bad thing

The install on this is something you'd expect on a factory piece. Drilling 13 holes to screw it on after putting it on with double sided tape seems a little overkill, but that's not a bad thing. It is made to be high quality, I am happy with the finished product.

MatthewM

Year: 2016 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
4/5

Installation Time: Afternoon

April 15, 2017

Perfect fit n finish

Real nice piece but scary install the thought of cutting into a brand new bumper much less taking it off the car but easy install just be careful and align the template with the tabs correctly and you wont have anything to worry about

dee23

Year: 2017 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 4
  4
5/5

Installation Time: Less than 1 Hour

March 09, 2017

Roush Rear Valance

This was a great detail for the S550 rear end. It's looks stock but the Rear Valance with the Corsa Wuad tips makes it stand out. Very Sexy

CharlesS550

Year: 2015 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 4
  4
5/5

Installation Time: Afternoon

February 16, 2017

Looks awesome!!!

Looks amazing and when you pair it with a corsa quad tip cat back exhaust, gives it an amazingly aggressive look to your s550!!! Helps if you get a second pair of hands to make it easier. The instructions that roush included where very helpful!!!

JuanGarcia

Year: 2015 Submodel: GT

Helpful (6) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

January 20, 2017

Awesome doesn't even describe it.

Excellent with the corsa quad tips. Fit was spot on just some modification but nothing big. I would recommend to anyone who's looking to run quad tips.

ChillWill

Year: 2016 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

December 10, 2016

Perfect Fitment

FACTORY LIKE FITMENT! Lined up perfectly with my Corsa Quad Tip exhaust. Template that came in package really helped out with the drilling!

S550VINCE

Year: 2016 Submodel: GT

Helpful (5) Thanks for your input!
- Fit 5
  5
- Appearance 5
  5
- Bang for your Buck 5
  5
5/5
October 11, 2016

Game Changer

Awesome product from AM as always. Installation was a little challenging as the template was a bit off. Be patient and measure the whole to get it done correctly. END RESULTS ARE SO WORTH IT!!

fiveoh

Year: 2015 Submodel: GT

Helpful (6) Thanks for your input!

Roush Rear Valance (15-17 GT Premium, EcoBoost Premium)