Mustang Roush GT Axle Back Exhaust (2015) Installation Instructions
This Axle Back Exhaust from Roush will fit all 2015 GT Mustangs.
The stock exhaust on your 2015 Mustang GT is better than previous generations, but still not loud enough or efficient enough for many owners. For years, Roush has been selling some incredibly efficient and beautiful sounding axle back exhausts. This Roush Axle Back Exhaust takes less than an hour to install and will work well on your Mustang GT for years to come.
Tools Required:
- 3/8-inch Ratchet
- 6-inch Extension
- 13mm Socket
- 15mm Socket
- File
- Sawzall
- Black Marker
- Lift or Jack/Jack Stands
Install Difficulty:
- Easy Project
1. To start the installation of your new Mustang Roush 421834 Axle Back Exhaust, safely lift the vehicle either with a lift or a jack and jack stands. This installation will utilize a jack and jack stands.
2. Draw a vertical line with the marker at the point in which the Mustang exhaust pipe straightens out (tangent to the curve).
3. Repeat the previous step on the opposite side.
4. Place the jack under the muffler about to be cut. This will aid in keeping it from falling.
5. Use the sawzall to make the cut.
6. Pull the muffler towards the front of the vehicle to release from the exhaust hanger.
7. Take the file and clean up the edges of the cut pipe.
8. Install the Roush muffler on the exhaust hanger.
9. Place a clamp over the end of the Mustang muffler. Slide the muffler over the cut pipe until seated fully.
10. OPTIONAL: To aid in proper alignment of the Mustang exhaust tip, loosen the exhaust hangers located on the IRS sub-frame.
11. Align the exhaust tip from your Mustang axle back exhaust in the rear valence opening.
12. Tighten the clamp with a 15mm socket and ratchet or low impact torque wrench.
13. Repeat the process for the opposite side muffler. Remember to tighten the IRS sub-frame Mustang exhaust hangers if loosened for aid in alignment.
14. Lower the vehicle and slide the exhaust tips onto the mufflers with the clamp. Tighten down when proper position is achieved.
15. Enjoy your new Mustang Roush Axle Back Exhaust. Re-torque all of the clamps after 5 heat cycles.
