11-14 Ford Mustang V8 5.0L Roush Performance 421127 Enhanced Sound Dual Axle-Back w/ Round Tips

The Roush Performance 421127 Axle-Back Exhaust Kit is a great upgrade for your Mustang GT or GT500. It delivers an aggressive sound, increased performance, and a sleek look. It is easy to install and durable.

Top Features:

  • Aggressive sound tone and volume
  • Increased horsepower and torque
  • Open-chambered muffler design
  • 304 stainless steel tips with chrome flashing and Roush logo
  • 3 year limited warranty

Vehicle Fitment:

  • 2011-2014 Ford Mustang GT 5.0L V8
  • 2011-2012 Ford Mustang GT500 5.4L V8
Vendor: Roush
SKU: RSH421127
Availability: 21 In Stock
$ 749.99 USD
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UPC: 844764003637
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Roush Performance 421127 11-14 Ford Mustang V8 5.0L Enhanced Sound Dual Axle-Back w/ Round Tips

If you are looking for a way to upgrade your Mustang’s exhaust system and unleash its full potential, look no further than the Roush Performance 421127 Axle-Back Exhaust Kit. This kit is designed to fit the 2011-2014 Mustang GT 5.0L V8 and the 2011-2012 Mustang GT500 5.4L V8, and it features an innovative open-chambered muffler design that delivers an aggressive sound that is unique to Roush, without the annoying drone at cruising speeds. The kit also includes high-quality stainless steel pipes and tips that are polished to a mirror finish and embossed with the Roush logo. The Roush Performance 421127 Axle-Back Exhaust Kit is the perfect choice for Mustang enthusiasts who want to enhance their vehicle’s performance, sound, and appearance.

Key Features:

  • Fits 2011-2014 Mustang GT 5.0L V8 and 2011-2012 Mustang GT500 5.4L V8
  • Provides an aggressive sound tone and volume
  • Increases horsepower and torque by improving airflow and reducing back pressure
  • Features an open-chambered muffler design that eliminates fiberglass packing
  • Includes 304 stainless steel tips with chrome flashing and Roush logo
  • Mounts to the factory mounting points and pierce points
  • Does not affect emissions or warranty

Benefits:

  • Enhances your Mustang’s performance and sound
  • Gives your Mustang a distinctive and sporty look
  • Improves your driving experience and enjoyment
  • Offers durability and longevity
  • Comes with a 3 year limited warranty
  • Easy to install with no modifications required

Product Specs:

  • System Material: 304 stainless steel pipes and muffler
  • System Style: Rear axle-back
  • Exhaust Type: Dual
  • Exit Location: Rear
  • System Finish: Natural
  • Catalytic Converter(s) Included: No
  • Intermediate Pipe Diameter (in.): 2.50 in.
  • Muffler Included: Yes
  • Muffler Quantity: Two
  • Muffler Configuration: Single inlet/Single outlet
  • Muffler Style: Chambered
  • Muffler Material: 304 stainless steel
  • Muffler Finish: Natural
  • Hardware Included: Yes
  • Inlet Quantity: 2
  • Tailpipe Diameter (in.): 2.50 in.
  • Tip Included: Yes
  • Tip Outlet Size (in.): 3.50
  • Tip Quantity: 2
  • Tip Shape: Round
  • Tip Cut: Slant
  • Tip Edge Style: Rolled edge
  • Tip Material: 409 stainless steel
  • Tip Finish: Polished

Install Difficulty Level:

  • The installation of the Roush Performance 421127 Axle-Back Exhaust Kit is quick and easy, and it uses all of the factory hanger locations and pierce points. No modifications to the vehicle are necessary, and the kit includes all the necessary hardware and instructions. The installation can be done in less than an hour with basic tools, such as a 8mm socket, a 10mm socket, a T-20 TORX bit, and a flat screwdriver. You can also find the installation manual on the Roush Performance website.

Vehicle Fitment:

  • The Roush Performance 421127 Axle-Back Exhaust Kit is compatible with the following vehicles:
    • 2011-2014 Ford Mustang GT 5.0L V8
    • 2011-2012 Ford Mustang GT500 5.4L V8

If you have any questions about this product or to report product description inaccuracies, contact the MPT Performance experts at (407) 636-7077 or by email.

Shipping Policy

MPT is proud to offer free shipping on most orders over $149.

  • Free shipping applies only to the contiguous United States. Shipping and handling charges will apply to orders outside the contiguous US, and the buyer is responsible for any duty fees or taxes their home country may charge to import goods.
  • With free shipping, we will choose the best shipping method for your order. We use all major carriers, including USPS, FedEx, UPS, and DHL.

Turnaround Times:

  • MPT Tunes have a standard turnaround time of 2-3 business days, beginning once we receive your MPT Tune Form.
  • We do not process orders on weekends or observed holidays, which do not count as business days.
  • Physical items that are in stock at MPT and ordered by 4PM EST will be shipped the same day. Orders placed after 4PM EST will be processed on the following business day.

Special Considerations:

  • Items not stocked at our location will follow the same processing times but may experience lead-time delays and could incur additional charges. Shipping methods may vary for these items based on what was paid and the requested delivery speed. If you need an item by a specific deadline, please contact an MPT Expert.
  • SCT Tuner Orders with the Prioritized Order option must have their tune forms submitted by 3PM EST to be completed the same day. Forms submitted after this time will be processed the next business day.
  • Orders will ship to the billing address listed on your order. If paying by credit or debit card, we can only ship to the billing address. Contact an MPT Expert for assistance if you need a different shipping address.

MPT Performance Returns and Refund Policy

  • A Return Authorization Number (RA #) is required for all returns. Please contact an MPT Expert to obtain an RA# before sending anything back.
  • MPT tuning charges and license fees are non-refundable. The sale is final once MPT has sent the tune file via email, which applies to both new tune purchases and tune updates.

Returnable Products:

  • Products (other than MPT Tunes) may be returned within 30 days as long as they have not been installed and are in brand new, unused condition with original packaging. Installed products are non-refundable. MPT reserves the right to deny a return if the product shows signs of installation or damage.
  • Vehicle programmers/tuners that have loaded a tune onto a vehicle cannot be returned.

Refund Amounts:

  • Returns postmarked within 15 days of receipt will be refunded the purchase price minus the shipping cost MPT paid.
  • Returns postmarked between 16 and 30 days will be refunded the purchase price minus a 25% restocking fee and the shipping cost.
  • After 30 days, all sales are final.

Non-Refundable Items:

  • Shipping charges and any package insurance are non-refundable. If free shipping was applied to your purchase, the actual shipping cost will be subtracted from your refund.
  • HP Tuners Credits are non-refundable once they’ve been assigned to a device’s serial number, which occurs either during the purchase or upon completing the tune form.
  • Digital products like SCT Tuner Unlocks, HP Tuners Credits, or MPT Tunes cannot be refunded.
  • Decals/Stickers are non-refundable once received by the customer.
Year Make Model Submodel
2011-2014 Ford Mustang GT
2011-2012 Ford Mustang Shelby GT500

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