Your cart (0 item)
Free Shipping 
QUALITY CRAFTSMANSHIP 
30 Day Return Policy 
E-mail & DM Support -
![]()
Free Shipping -
![]()
QUALITY CRAFTSMANSHIP -
![]()
30 Day Return Policy -
![]()
E-mail & DM Support
89 Reviews on
2018-23 S550 Mustang Quad Exhaust EMP Tempest Rear Diffuser
10 Left In Stock
DESCRIPTION
Click to view all EMP 2015-23 Mustang Rear Diffuser Designs
The S550 Mustang Tempest Rear Diffuser for Quad Exhaust models is crafted from robust 1/4" high-density polyethylene material. It features unique and aggressive form fit styling that significantly stands out from other diffusers on the market.
Includes 5 center blades mounted to the downforce center section with 2 air diverter under blades plus 2 side blades with 2 underside air diverter blades each. Provides great aerodynamic benefits while looking incredible.
Installation is a breeze thanks to its pre-drilled mounting holes — a feature absent from competing products, leaving you guessing where to position the screws.
Our design includes a slotted attachment to two pre-existing bolts, ensuring the center section is perfectly aligned. This also allows for adjustment to achieve your preferred gap distance from the car's rear. We provide stainless steel hardware and screw locks to facilitate an effortless secure installation process that will look great for years to come.
Demonstrating its strength and stability, this S550 Mustang rear diffuser remained steady during high speed and impact testing. Installation is simple – check out the installation video near the bottom of this page.
FEATURES
• USA-made Premium s550 Mustang Rear Diffuser expertly crafted from robust 1/4" HDPE
• Adjustable for custom spacing from rear of car
• Exotic muscle addition to make your Mustang unique
• Simple screw-in installation with instructions provided
• Custom Made for 2018-23 Mustang GT and EcoBoost QUAD EXHAUST only with stock rear bumper (will not fit Mach 1 or Shelby models)
SHIPPING INFORMATION
FREE SHIPPING on standard orders over $49 within the continental United States. We utilize USPS, UPS, and DHL for
shipping services. For shipping addresses within 48 contiguous United States, next-day shipping on most parts if you place your order by 5 PM CST. UPS does not deliver to P.O. boxes, so we recommend a physical address. Non-returnable custom orders may take up to 10 days to ship.
Most parts ship the next business day unless they are out of stock or are custom orders. In the continental U.S., standard ground delivery takes approximately 3-5 business days. We offer 3-day, 2-day, or 1-day shipping options for faster delivery, shipped the next business day if ordered by 5 PM CST. Custom orders can take up to 10 days or more to ship. For APO/FPO addresses, shipping can take up to 2 months via USPS.
“Thank you so much for your great customer service! Your products are of great quality and I get so many compliments!”
EMP – QUALITY AMERICAN MUSCLE CAR MODS
Quality isn't just our reputation; it's our promise.
Evans Motorsport Performance is the creation of father-son duo Travis and Cole Evans. Your vehicle deserves nothing short of excellence, and that's precisely what we provide. Every EMP component is built at our Houston, Texas, facility.
Our commitment? To provide you with top-tier, USA-made car modifications you can install with absolute pride and trust.
MAKE YOUR MUSTANG EVEN MIGHTIER
Boost your Mustang’s aerodynamics and style with this high-quality EMP S550 Mustang Rear Diffuser
Exotic Muscle Styling
Premium adjustable S550 Mustang rear diffuser is custom-designed to match your Mustang's contours and make it stand out. Adds an aggressive, low-look aesthetic that will turn heads wherever you go.
EMP Precision Quality
Made in the USA from robust 1/4" high density polyethylene (HDPE). Precision-machined to ensure a high-quality, perfect fit.
Easy Screw-In Installation
This S550 Mustang diffuser has pre-drilled holes for secure attachment to your stock rear bumper using provided stainless steel hardware and screw locks.
WHY CHOOSE AN EMP S550 Mustang REAR DIFFUSER
Just like your Mustang, our mods stand out from the crowd. Here’s how:
Made in the USA from 1/4" HDPE
Exceptional Durability & Enduring Good Looks
Exotic Muscle Edition That Gets Attention
Easy and Simple Screw-In Installation
Easily Adjustable to Desired Distance
Fits 2018-2023 S550 Quad Exhaust Mustangs
WHAT’S IN THE BOX
We aim to make installing your new parts as quick and easy as possible. As well as your mod parts, we give you all the info you need for an efficient installation. Here’s what you get:
- Diffuser Center Section with 5 Blades and 2 Air Diverter Blades
- 2 Side Blades with 2 Air Diverter Blades Each
- Stainless Steel Assembly and Mounting Hardware
- Installation Guide Download (Videos Below). Click here to download pdf.
OUR CUSTOMERS LOVE THEIR EMP MODS
89 Reviews on
Emailed and explained what I needed and they knew right away what part I needed and sent it in.
Aggressive look. This rear diffuser will give such an aggressive and unique look to your Mustang. I love it.
I’ve purchased 5 different rocker splitters. This is the best one, by far. Functional & made of metal. Quality product & durable.
All the parts I’ve ordered from EMP are 11/10 quality not to mention the customer service is impeccable. The diffuser is perfect fits the car great...12/10 experience
HOW TO INSTALL YOUR EMP S550 Mustang REAR DIFFUSER
TEMPEST ASSEMBLY AND INSTALL VIDEO COMING VERY SOON. VIDEO ABOVE IS FOR OUR OTHER DIFFUSER DESIGN BUT WILL GIVE YOU AN IDEA OF THE INSTALL.
FREQUENTLY ASKED QUESTIONS
Will this diffuser fit my S550 Mustang?
Yes, if you have quad exhaust and the stock bumpers shown at the link below. Not for Shelby or Mach 1 models.
2018-23 GT and EcoBoost High Performance Pack Quad Exhaust ↓
What is Evans Motorsport Performance?
Evans Motorsport Performance, is founded, owned, and operated by father and son Travis and Cole Evans. We're dedicated to crafting car mods that outclass and outlast, all with a seamless installation. Quality isn't just our reputation; it's our promise. Your ride deserves excellence, and we deliver.
Where do you make your mods?
We build each EMP part at our Houston, Texas hub - no distant factories in faraway lands here. Our mission? Delivering peak-quality, American-made car mods you can install with pride and confidence.
How do I get my mods?
Revamping your muscle car is easy with us. Select your vehicle, and pick the custom mods you want. We can source them from over 1,500 quality suppliers if you need help finding them. Finally, sit back and let us speed-ship your order, free for $49+ buys.
My part doesn’t fit. Can I get all my money back?
We’ll refund your money, less any merchant or restocking fees we incurred which we’re unfortunately unable to refund.
What's your shipping policy?
We offer FREE SHIPPING on standard orders over $49 within the continental United States. We utilize USPS, UPS, and DHL for shipping services. For shipping addresses within 48 contiguous United States, we offer Next-day shipping on most parts if you place your order by 5 PM CST. UPS does not deliver to P.O. boxes, so we recommend a physical address. Custom orders, which are non-returnable, may take up to 10 days to ship.
How long until I get my mods?
Most parts ship the next business day, unless they're out of stock or are custom orders. If you're in the continental U.S., standard ground delivery takes approximately 3-5 business days. We offer 3-day, 2-day, or 1-day shipping options for faster delivery, which are shipped out the next business day if ordered by 5 PM CST. Custom orders can take up to 10 days or more to ship. For APO/FPO addresses, shipping can take up to 2 months via USPS.
89 Reviews on2018-23 S550 Mustang Quad Exhaust EMP Tempest Rear Diffuser
10 Left In StockRECENTLY VIEWED PRODUCTS
Ready for next-level Muscle Car mods?
Take a look at our most popular and purchased mod collections.
SUBSCRIBE TO OUR NEWSLETTER FOR
THE LATEST HOT OFFERS
Get the lowdown on our newest mods and other cool AF stuff. Be in pole
position for incredible deals and exclusive offers.
We don’t spam or share your info.Free Shipping QUALITY CRAFTSMANSHIP 30 Day Return Policy E-mail & DM Support -
![]()
Free Shipping -
![]()
QUALITY CRAFTSMANSHIP -
![]()
30 Day Return Policy -
![]()
E-mail & DM Support
