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How to Install Borla ATAK Cat-Back Exhaust w/ Black Chrome Tips (15-17 GT Fastback) on your Ford Mustang

Tools Required
  • 3/8” Drive Ratchet
  • 3/8” Drive Extension 3”
  • 15mm Socket
  • 13mm Socket
  • Flat blade screwdriver
  • 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 Cat -Back Exhaust System.  

Taking all under car safety precautions, lift the vehicle using a hoist or hydraulic lift. Once this has been done, you may b egin 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 Cat-Back  Exhaust System. 

Original Exhaust System Removal

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

1. Loosen (2) factory band clamps on the factory mid-muffler. (See Fig.1)  

2. Beginning with the left-side, use a flat blade screwdriver and twist to re-lease the pin and slide the left-side band-clamp away from the muffler. (See Fig. 2)  

3. Repeat Step 2 to remove the right-side band-clamp.  

4. Lubricate all hangers and rubber isolators.  

5. Loosen (2) factory bolts on both rear left-side and right-side rubber brack-ets. Leave rubber isolator assembly on muffler hangars. (See Fig. 3)  

6. With help from an assistant, carefully remove the front hangars from the rubber isolators and slide the muffler assembly rearwards leaving rear rub-ber isolators on hangars. (See Fig. 4 )  

7. Factory exhaust from the vehicle. (See Fig. 5)  

Warning: Use extreme caution during installation. Torque all fasteners accord-ing 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. 





Warning: Use extreme caution during installation. Torque all fasteners according to manufacturer’s torque values and tight-ening 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 

NOTE: 140629 & 140630 includes (1)-L/H and (1)-R/H Extension Pipe. These pipes are used to connect the X-Pipe to Borla PN-17290 Long Tube Header, completing a true-dual 3- inch Off-Road-Use-Only exhaust system. 

When installing 140629 or 140630 to the factory band-clamps and catalytic converter pipes, use the included (2) Nipples. 

1. Transfer the both brackets & rubber isolators from factory exhaust to the vehi-cle using factory hardware. Tighten to 20 ft lbs. (Refer to Fig. 3 image)  

2. Install the Left-side and Right-side factory band clamps onto the X-pipe. (See Fig. 6) DO NOT TIGHTEN THE CLAMP BOLTS.  

3. Install the L/H Intermediate Pipe Assembly to the Left-side of vehicle insert-ing the hangers into the rubber isolators. (See Fig. 7)  

4. Repeat Step 2 for the R/H Intermediate Pipe Assembly installation to the right -side. (See Fig. 8)  

5. Starting on the left-side, place a clamp on the L/H Muffler Assembly inlet pipe. Position the L/H Muffler Assembly hangar into the rear rubber isolator then insert into the L/H Intermediate Pipe Assembly . (See Fig. 9) DO NOT TIGHTEN THE CLAMPS.  

6. Repeat Step 4 for installation of the R/H Intermediate Pipe Assembly . Check your exhaust system for proper clearance under the vehicle and also for tip alignment. (See Fig. 10)  7. Start tightening clamps on your new exhaust beginning at the X-Pipe and mov-ing to the Rear Mufflers. Once position has been determined to be correct, tighten the Accuseal™ clamps to 32-35 ft. lbs. making sure the clamp bolts are centered between the notches in the pipe.  

7. Before starting your vehicle, make sure to check all wires, hoses, brake lines, body parts and tires for safe clearance from the exhaust system.  

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

Note: When you first start your vehicle after the installation of your new Bor-la Performance Exhaust System, there may be some smoke and fumes coming from the system. This is a protective oil based coating used in the manufac-turing 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. 

Congratulations!!! You have completed the installation of the world famous Borla Perfor-mance Stainless Steel Exhaust System. 





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