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How to Install Borla ATAK Cat-Back Exhaust (99-04 Cobra) on your Ford Mustang

Installation Time

2 hours

Tools Required
  • 3/8” Drive Ratchet
  • 3/8” Drive Extension 3”
  • 15mm Deep Well Socket
  • Pry Bar
  • Spray Lubricant
American Muscle
Shop Parts in this Guide

Borla Performance Cat-back™ Bill of Materials

Caution!!! Never work on a hot exhaust system. Serious injury in the form of burns can result If the vehicle has been in use and the exhaust system is hot, allow vehicle to cool for at least 1 hour. Always wear eye protection when working under any vehicle.  

Note: It is our recommendation that you use a hoist or hydraulic lift to facilitate the installation of your new Borla Performance Rear Section Exhaust System.  

Taking all under car safety precautions, lift the vehicle using a hoist or hydraulic lift. Once this has been done, you may begin the removal of your old exhaust system from your vehicle.  

Note: Before removing the original exhaust system from your vehicle, please compare the parts you have received with the bill of materials provided on the previous page to assure that you have all the parts necessary for the installation of your new Borla Performance Rear Section Exhaust System. 

Original Exhaust System Removal

Note: With a used vehicle, we suggest a penetrating spray lubricant to be applied liberally to all exhaust fasteners and allowing a significant period of time for the chemical to lubri-cate the threads before attempting to disassemble. 

1. Unbolt the flanges located in of each muffler/tailpipe as-sembly. (See Fig.1)  

2. Beginning with the passenger side, using a muffler stand or an additional person to hold the exhaust up in place, re-move all the hangers from the rubber brackets.  

3. Remove the passenger side exhaust from the vehicle. (See Fig.2)  

4. For the removal of the driver side exhaust, repeat steps 2 and 3.  

Warning: Use extreme caution during installation. Torque all fasteners according to manufacturer’s torque values and tightening sequence. DO NOT use air impact tools to tighten fasteners on Borla Performance Exhaust Systems. Use of such tools may result in bent flanges or gasket contact areas leading to exhaust leaks. 

Borla Performance Cat-Back  Exhaust System Installation 

1. Place one flange on each flared front pipes and place them into posi-tion using the original hardware. DO NOT TIGHTEN CLAMP BOLTS. (See Fig.3)  

2. Place a clamp over the expanded end of the left and right muffler as-semblies and place each one  

3. into position installing the hangers into the rubber brackets. DO NOT tighten the clamps. (See Fig.4)  

4. Place a clamp over the expanded end of left and right tail pipe assem-blies and place each one into position making sure to install the hang-ers into the rubber brackets. DO NOT TIGHTEN CLAMP BOLTS. (See Fig.5 & 6)  

5. Check your exhaust system for proper clearance under the vehicle and also for tip alignment.  

6. Once position has been determined to be correct, tighten the Accuseal clamps to 32-35 ft. lbs.  

7. Secure the flanges located in front of the muffler assemblies to the ve-hicle manufacturer recommendations.  

8. Before starting your vehicle, make sure to check all wires, hoses, brake lines, body parts and tires  

9. for safe clearance from the exhaust system.  

10. Start vehicle and check for any leaks. If any leaks are found, determine cause (such as loose or incorrectly positioned clamp) and repair as nec-essary.  

Note: When you first start your vehicle after the installation of your new Borla Performance Exhaust System, there may be some smoke and fumes coming from the system. This is a protective oil based coating used in the manufacturing of mandrel bent performance exhaust tubing. This is not a problem and will disappear within a very short period of time after the exhaust has reached normal operating temperatures. 

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