How to Install Borla True Dual Cat-Back Exhaust (05-10 V6) on your Ford Mustang

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 lubricate the threads before attempting to disassemble.

1. Loosen the clamp shown in figure 1 located just behind the y pipe assembly.

2. Loosen the clamp shown in figure 2 located just in front of the muffler assembly.

3. Using a flat blade screwdriver, pull the locking clip to disengage it from the pipe. Remove the over axle pipe by first removing the front of the pipe from the y-pipe as shown in figure 3 then remove it from the muffler assembly.

4. Remove the hangers from the rubber isolators and remove the muffler from the vehicle as shown in figure 4.

5. On the factory y-pipe assembly, measure 3 inches behind the hanger bracket on both left and right pipe and mark as shown in figure 5.

6. Using a reciprocating saw or a chain style pipe cutter, cut the pipes as shown in figure 6 and remove the factory y-pipe assembly shown in figure 7.

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.

1. Place a clamp over the reduced ends of the X-pipe assembly and set it up into position as shown in figure 8. Do Not tighten the clamps.

2. Place a clamp over the expanded ends at the rear of the X-pipe assembly and install both left and right over axle pipes. Do Not tighten the clamps.

3. Measure the center of the right exhaust cut out from a reference point of your choosing. Use this measurement to mark the center of the left exhaust cutout.

4. Place the template supplied with your system onto the rear bumper aligning the center with your mark. Trace the cut out onto the bumper using a pencil or something similar. Note: Double check the position of the cutout before making any cuts.

5. Once the position of the cut out has been determined to be correct. Cut the bumper approximately 1/4” under the tracing using a rotary cutting tool or something similar.

6. Using a drum sander smooth and shape the cut.

7. Using the hardware supplied install the brackets on the left (driver) side of the vehicle into the existing threaded holes as shown in figure 11.

8. Place a clamp over the expanded end of the left (driver) side muffler assembly and set it into position as shown in figure 12. Do Not tighten the clamp.

9. Repeat step 8 for the installation of the right (passenger) muffler assembly. Do Not tighten the clamp.

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

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

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

13. 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 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.