Upgrade the rear-end appearance of your S650 Mustang with the 2024–2026 Mustang S650 Dry Gloss Carbon Fiber Dark Horse Rear Diffuser Single/Quad Tips, manufactured by Auto Addict USA. Designed to fit 2024–2026 Ford Mustang EcoBoost, GT, and Dark Horse models, this diffuser gives the S650 platform a sharper, lower, and more aggressive motorsport-inspired rear appearance while maintaining clean integration with the factory rear bumper design.

Inspired by the aggressive styling found on the Dark Horse platform, this rear diffuser helps transform the rear profile of the Mustang with a more exotic performance look. The diffuser design enhances the lower rear section of the vehicle, giving the car a wider and more planted visual stance from every angle.

Each diffuser is manufactured by Auto Addict USA using dry carbon fiber and produced from a precision CNC mold to support track-inspired quality, consistent fitment, and refined body-line integration. The CNC mold process allows the diffuser to maintain sharper fin detail, cleaner shape accuracy, and a more premium fit compared to standard hand-shaped aftermarket components.

The dry gloss carbon fiber finish gives the rear of the vehicle a high-end motorsport appearance that pairs perfectly with carbon fiber spoilers, side skirts, front splitters, rear wings, and other exterior aero upgrades. Whether the car is being built for shows, content, weekend events, street presence, or a complete track-inspired build, this diffuser helps create a more complete and aggressive rear-end identity.

This diffuser is designed to support both single tip and quad tip exhaust configurations, allowing customers flexibility depending on their exhaust setup and preferred rear-end appearance. Whether you are running a factory-style exhaust layout or a more aggressive quad tip setup, this diffuser is designed to complement the overall styling of the S650 platform.

For the owner, this upgrade adds more than just appearance — it adds value, presence, and a more premium finish to the overall build. Rear diffusers are one of the most noticeable rear aero upgrades, helping visually lower the car while giving it a more serious and performance-focused look.

Why This Rear Diffuser Is Worth The Investment

This is not a basic rear bumper add-on. The value comes from the dry carbon fiber construction, the precision CNC mold production process, and the aggressive Dark Horse-inspired design language.

Instead of installing a generic diffuser that may not flow with the factory rear bumper lines, this diffuser is designed to visually integrate with the S650 platform while adding a cleaner and more premium motorsport appearance. The result is a rear-end upgrade that helps make the vehicle feel more complete, more aggressive, and more valuable.

Key Features

• Fits 2024–2026 Ford Mustang S650 EcoBoost, GT, and Dark Horse models
• Manufactured by Auto Addict USA
• Dark Horse-inspired rear diffuser styling
• Designed for single tip and quad tip exhaust configurations
• Manufactured from dry carbon fiber
• Produced using a precision CNC mold
• CNC mold process supports track-inspired quality and fitment
• Premium dry gloss carbon fiber finish
• Helps create a wider and lower rear-end appearance
• Adds aggressive motorsport-inspired styling
• Designed to pair with carbon fiber spoilers, side skirts, and front aero upgrades
• Adds premium visual value and exclusivity to the vehicle
• Ideal for show builds, street builds, content cars, and track-inspired Mustang projects
• Designed for customers who want high-quality carbon fiber styling with clean body-line integration

Vehicle Fitment

Make: Ford
Model: Mustang S650
Years: 2024, 2025, 2026
Trims: EcoBoost, GT, and Dark Horse

Exhaust Tip Compatibility

This diffuser is designed to work with both single tip and quad tip exhaust setups depending on the customer’s preferred rear-end appearance and exhaust configuration.

Installation Notes

Professional installation is highly recommended. This is a premium aftermarket carbon fiber rear diffuser and may require test fitting, alignment, adjustment, and proper body shop installation for best results. Please test fit all components before final installation. Minor adjustment may be required depending on vehicle condition, trim package, exhaust setup, and previous modifications.

Order Processing Time

In-Stock Items
All in-stock ground items are processed and shipped within 5–7 business days after the order is placed. Orders are not processed or shipped on weekends or holidays.

Made-to-Order & Custom Items
All made-to-order and custom items are typically processed and shipped within 8–16 weeks, but may take longer during periods of high order volume.

If you are unsure about the processing time for a specific item, please contact us at support@simpbuilt.com prior to placing your order.

Pre-Order / Made-to-Order Shipping

Pre-order and made-to-order items will ship within the timeframe stated on the product page, typically 8–16 weeks after purchase, unless otherwise noted.

Please note:

• All shipping dates are estimates only

• Delays may occur due to production or carrier-related issues

• We will make every effort to keep you informed of any significant changes to your order status

Shipping Rates & Delivery Estimates

Free Shipping (Lower 48 States)
We offer free ground shipping on orders over $150 within the lower 48 United States for items stocked in Simp Built warehouses.

Simp Built reserves the right to charge shipping in cases where the delivery address exceeds carrier size, weight, or package limitations. This determination is made solely at the discretion of Simp Built.

Standard Shipping Service

• Economy Shipping: Estimated 5–7 business days after processing

Delivery delays may occasionally occur due to weather, carrier issues, or other unforeseen circumstances.

Shipment Confirmation & Order Tracking

Once your order ships, you will receive a shipment confirmation email containing your tracking number(s).
Tracking information may take up to 24 hours to become active.

Shipping to P.O. Boxes or APO/FPO Addresses

We do not ship to P.O. Boxes or APO/FPO addresses. A valid physical address is required for all orders.

International Shipping Policy

Simp Built currently does not ship outside of the United States.

If you are interested in placing an international order, please contact us directly prior to purchase.

Customs Brokers

For any international orders (if approved), customers are required to hire and coordinate with a customs broker to manage the import process. The customer is solely responsible for all customs procedures. Simp Built does not arrange customs brokers or manage customs clearance on the customer’s behalf.

Shipping Damages & Liability

While we take every precaution to package items securely, Simp Built is not responsible for damage caused by shipping carriers, including but not limited to freight/LTL carriers, FedEx, or UPS.

Please inspect all packages immediately upon delivery.

• All damage claims must be filed directly with the carrier

• Failure to file a claim promptly may result in claim denial

Lost or Stolen Packages

Simp Built is not responsible for lost or stolen packages once they have been marked as delivered by the carrier.

Please ensure your delivery location is secure. For missing packages, contact the carrier directly.

Return Shipping

Customers are responsible for all return shipping costs unless the return is due to a defect or an error on our part.

• Shipping costs are non-refundable

• Return shipping fees will be deducted from any approved refund

Additional Shipping Information

• For returns valued over $75, we strongly recommend using a trackable shipping service 

• We do not guarantee receipt of returned items without tracking

• Any customs fees, duties, or taxes (if applicable) are the responsibility of the customer

Eligibility for Returns

To be eligible for a return, the item must be unused, in its original packaging, and in the same condition as when received. Any item that has been installed, attempted to be installed, or is not in its original condition will not be accepted for return.

All returns must be accompanied by a receipt or proof of purchase. Any and all returns must be approved by Simp Built Custom and accompanied by a Return Merchandise Authorization (RMA) number. Any return received without an approved RMA will be denied, and the customer will forfeit all shipping costs and applicable restocking fees associated with the return. There are no exceptions to this policy.

Non-Returnable Items

• Custom Orders (no refunds; store credit may be offered at our discretion if cancellation is requested prior to shipment)
  

• Open box items

• Used, modified, or painted items

• Any item that has been installed or shows signs of attempted installation

• Any item that is not in its original condition or has missing components

• Items without valid proof of purchase

Cancellation Policy

Order cancellations must be requested within 24 hours of purchase and are subject to approval by Simp Built Custom.

If a cancellation request is approved within the 24-hour window, the order will be subject to a 30% restocking fee. After 24 hours, orders cannot be cancelled, as processing or production may have already begun.

Custom items are not eligible for cancellation or refund once production has started.

Restocking Fee

A 30% restocking fee will be applied to all approved returns. This fee covers processing time, labor, and materials associated with preparing and packing returned items.

Return Shipping Costs

Customers are responsible for paying all return shipping costs. Shipping costs are non-refundable. If a refund is issued, the cost of return shipping will be deducted from your refund.

Refunds

Once your authorized return is received and inspected, you will be notified via email of the approval or rejection of your refund.

If approved, the refund — minus the 30% restocking fee — will be processed and automatically applied to the original method of payment within 7–10 business days.

Inspection of returned items may include both a physical condition check and an operational test. Inspections may take 2–4 business days after receipt before a refund is processed.

Late or Missing Refunds

If you have not received your refund, please take the following steps:

1. Check your bank account again

2. Contact your credit card company, as posting times may vary

3. Contact your bank for additional processing information

If you have completed these steps and still have not received your refund, please contact us at support@simpbuilt.com

Shipping Instructions for Returns

Authorized returns must be shipped using a trackable shipping service. For items valued over $75, we strongly recommend purchasing shipping insurance.

SimpBuiltCustom is not responsible for lost, damaged, or missing return shipments. Customers are fully responsible for any charges or damages related to returned goods.