How to Install Flowmaster 2.25 in. Scavenger Series Resonator Delete X-Pipe (15-17 V6) on your Ford Mustang

This X-pipe assembly is designed to be used with either the factory mufflers or a Flowmaster axleback system. The steps on the following two pages are intended for customers replacing the center resonator of their vehicle and retaining the use of the factory Mustang mufflers. If you are using the new Flowmaster X-pipe along with a Flowmaster axle-back system, please see pages 3 thru 5 below.

Removal:

1) Raise the vehicle up on a hoist or rack to working height. If you don’t have access to a hoist or rack, raise the vehicle and support securely with jack stands. To ease the removal of the stock system, spray a penetrating lubricant onto the bolts of the two clamp connections just forward of the center resonator.

3) Support the center resonator with a stand and loosen the four nuts at the two band clamp connections at the resonator inlet. Using a screwdriver, pry up the clips on the clamp body to release the clip from the tab on the inlet pipes. Slide the clamp assemblies slightly back to clear the tabs. You can now lower the rear of the resonator and slide the assembly to the rear of the vehicle to remove. Lower the resonator from the vehicle and set aside.

2) Remove the factory band clamps from the factory exhaust system and place them onto the downpipes behind the catalytic converters. Place the 86348S X-Pipe assembly into place behind the factory downpipes, support the rear of the assembly with a stand. Slide the clamps back to the bump stops on the X-Pipe and tighten both band clamps enough to hold, but still allow for adjustment. Be sure that the X-Pipe assembly is fully forward, and that the embossed Flowmaster in the center case is facing the ground before tightening.

3) Place a supplied clamp over the inlet pipe of the passenger side stock muffler. Slide the muffler toward the rear of the vehicle and place the inlet into the adapter at the back of the X-Pipe assembly. Slide the clamp onto the slip connection and tighten enough to hold in place. Repeat this step on the drivers’ side of the vehicle.

4) Adjust and level the X-Pipe and muffler assemblies to provide a satisfactory fit. A minimum of 1/2” clearance around all parts of the system must be maintained; while keeping suspension travel and vibration in mind. After adjustments have been made, you may now securely tighten the clamped connections.

5) For a more secure installation, we highly recommend placing a minimum 1” weld on either side of the inlet slip-fit connections.

The following instructions will describe the steps required to install X-Pipe assembly #81107 with a Flowmaster Axle-back system.

Removal:

1) Raise the vehicle up on a hoist or rack to working height. If you don’t have access to a hoist or rack, raise the vehicle and support securely with jack stands. To ease the removal of the stock system, spray a penetrating lubricant onto the bolts of the two clamp connections just forward of the center resonator as well as the rubber hangers just behind the rear differential and at the rear of the vehicle.

3) Using a 13mm wrench, loosen the two hangers just behind the rear differential from the cross member and the two hanger mounts at the rear of the vehicle from the frame. Slide the muffler assemblies toward the rear of the vehicle to disengage them from the factory system. Leave them hanging in place for re-assembly onto the Flowmaster X-pipe assembly.

4) Loosen the four nuts at the two band clamp connections at the inlet of the center resonator. Using a screwdriver, pry up the clips on the clamp body to release the clip from the tab on the inlet pipes. Slide the clamp assemblies slightly back to clear the tabs. With the help of an assistant, carefully lower the stand and slide the assembly back to disengage from the inlet pipes.

1) Remove the factory band clamps from the factory exhaust system and place them onto the downpipes behind the catalytic converters. Place the 86348S X-Pipe assembly into place behind the factory downpipes while supporting the rear of the assembly with a stand. Slide the clamps back to the bump stops on the X-Pipe pipe and tighten both band clamps enough to hold, but still allow for adjustment. Be sure that the X-Pipe assembly is fully forward, and that the embossed Flowmaster in the center case is facing the ground before tightening.

2) Place the inlets of the axle-back muffler assemblies onto the back of the Flowmaster X-pipe, be sure to slide them fully on and tighten the clamps enough to hold, but still allow for adjustment.

3) Adjust and level the X-Pipe and muffler assemblies to provide a satisfactory fit. A minimum of 1/2” clearance around all parts of the system must be maintained; while keeping suspension travel and vibration in mind. After adjustments have been made, you may now securely tighten the clamped connections.

4) For a more secure installation, we highly recommend placing a minimum 1” weld on either side of the inlet slip-fit connections.