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How To Install Bassani X-Pipes for your 1999-2004 Mustang

Installation Time

2 hours

Tools Required
  • Ratchet
  • 15mm Deep Well Socket
  • 15mm Socket
  • Universal Joint Socket
  • Ratchet Extensions (need a couple)
  • Screw Driver
  • 22mm wrench (7/8”)
  • WD-40
  • Floor Jack
  • 2 Jack Stands
  • 2 Wheel Chocks
  • Exhaust flange gasket (optional but recommended)
American Muscle
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Removing Stock H-Pipe: 

1. Put a Wheel Chock behind each rear tire. Next jack the car up in the front and put on jack stands. 


2. Disconnect the battery. 

3. Spray all nuts and bolts with WD-40. Also spray the 02 sensors. 

4. Disconnect the 02 sensors. The front ones are a little hard to undo but it is possible to get them. 


5. Disconnect the stock h-pipe from your cat-back exhaust using a 15mm Deep Well Socket. 


6. Disconnect the stock h-pipe from the exhaust manifolds (headers) using a 15mm deep well socket. You will need to use the extensions to be able to reach them. On the passenger side you will need to use the universal joint in order to get the nut by the starter solenoid. 

7. Remove the stock h-pipe from the car. 


8. Remove exhaust flange gasket from passenger side exhaust manifold. 


9. Transfer 02 sensors to new x-pipe using 22mm(7/8”) wrench. 



Installing New X-Pipes: 

1. Slide the x-pipes together and put the clamps into position. Tighten the clamps so they are snug with the 15mm socket. 


2. Put new exhaust flange gasket into place. 

3. Slide the new x-pipes under the car and lift up and attach the pipes to the exhaust manifolds using 15mm deep well socket with extensions. Make sure that the passenger side bolts are centered through the holes or it may leak. 

4. Attach the x-pipes to the cat-back using the deep well socket. 


5. Adjust the straight pipes (or catalytic converter) so that it is centered between pipes. 


6. Tighten your clamps with the 15mm socket. 

7. Plug the 02 sensors back in. Once again the front sensors are hard to connect. You might need to line it up and use a long screwdriver to push it into place. 

8. Reconnect your battery. 

9. Start the car and test for leaks. To test take some soapy water and spray around the areas where there may be a possible leak. 


(Might have leaks in these spots on both sides. If you do just spin the clamp and make it tight and it should fix the problem)


10. Once all leaks are fixed lower your car and have fun. 


Installation Instructions Written By AmericanMuscle Customer Joe Turek 7/25/2013 

This guide applies to Mustang years: 1999, 2000, 2001, 2002, 2003, 2004 and Submodels: Bullitt, Cobra, GT