How To Install a Cat-Back Exhaust on an S650 Mustang

With the release of the S650 Mustang, enthusiasts everywhere are looking for ways to increase the base power of their new Mustangs. An aftermarket cat-back exhaust system opens up your 2024 Mustang's exhaust flow, adding power and transforming the way your S650 Mustang sounds.

Installing a cat-back exhaust on your S650 is simple and straightforward. There's no need to spend hundreds at a shop when you can install it yourself in your garage. Check out our video tutorial and step-by-step instructions below for a complete guide through the installation process. With a few tools, you can have your Mustang rumbling with a custom cat-back exhaust kit in less than an hour. Say goodbye to the stock sound and hello to new levels of power and style with this must-have mod for your S650.

2024+ Mustang Cat-Back Exhaust Install Instructions

Before You Get Started

Make sure you have a safe way to raise your Mustang and gain access to the exhaust system underneath the car. While having a lift makes an exhaust swap much easier, it isn't a necessity. Backing your Mustang up onto a set of ramps and chocking the front wheels gives you plenty of room to work. You could also use a jack and jack stands to lift your S650, but you'll have less room underneath the car.

For this installation, we used the MBRP race cat-back exhaust system for the 2024 Mustang fastback GT. This system is a direct-fit replacement for the factory exhaust, so the install process shown should be the same for any aftermarket kit. Expect an installation time of around one hour.

Required Tools:

• ⅜” Ratchet
• 13 mm Deep Socket
• 15 mm Deep Socket
• 8 mm Allen Key
• 2 ½” Whole Saw
• 9/16” Socket

Step 1: Remove Belly Pan

Remove the two screws at the base of the belly pan. Then, fold back the panel and remove the front screws. Set the belly pan aside.

Step 2: Disconnect Insulator Brackets

Unscrew the bolts on the two Insulator brackets. Slide the insulator bracket off of the subframe.

Step 3: Loosen Exhaust Clamps

Move to the front of the exhaust and locate the two clamps connecting the mid-pipe to the catalytic converter. Use a screwdriver to bend back the two clamp tabs. Next, use a wrench to loosen the four bolts holding the clamps in place. Do not fully remove the bolts yet.

Step 4: Pull Out Factory Exhaust

Slide the clamps towards the back of the exhaust and push the entire exhaust assembly towards the rear of the car until the muffler hanger arms come out of the factory hangers.

Make sure you have a second pair of hands helping to hold the two ends of the exhaust system.

Step 5: Retrieve Factory Clamps and Hangers

Remove the mid-pipe clamps and main hangers from the factory exhaust system to reuse on the new system.

Step 6: Bend Factory Hanger Bracket

There is a hanger bracket at the rear end of the exhaust system. If you are having trouble removing the exhaust system, bend the bracket towards the pipe so it is easier to remove the stock exhaust.

Step 7: Reinstall Factory Clamps

Reinsert the clamps onto the ends of the exposed pipes. Be sure to orient the nuts toward the passenger side of the car.

Step 8: Install New H-Pipe

Insert the h-pipe into the brackets. Be sure to support the opposite end of the pipe with a jack while you are installing the pipe. Tighten the clamp bolts, but don’t tighten them all the way to leave room for adjustments later.

Step 9: Reinstall Factory Hanger

Slide the hanger insulator bracket onto the extension pipe with the hook facing towards the front of the car. Press the hangers onto the hanger arms on the tailpipe. Be sure the hook on the hanger is facing towards the body of the car. If they're facing towards the exhaust tips, they won't be able to hang on the exhaust hanger bracket.

Step 10: Install New Extension Exhaust Pipe

Slide the tailpipe into the mid-pipe and attach the clamp between the pipes. Hook the hanger onto the slot in the exhaust insulator bracket. Tighten down the clamp bolt but don’t tighten it all the way.

Step 11: Install New Muffler

Slide the support rod for the new muffler into the rear hanger slot. Place the muffler into position and attach the factory clamp. Connect the extension pipe to the muffler and tighten down the clamp bolt, but don’t tighten it all the way.

Step 12: Install New Exhaust Tip

Slide the exhaust tip onto the end of the muffler and position it so it is aligned with the rear of your Mustang. Repeat steps 9-12 on the other side of the exhaust system.

Step 13: Reinstall Hanger Bolts

Reinstall the factory hanger bolts on both sides of the exhaust system to secure the main insulator brackets. Tighten down the bolts.

Step 14: Adjust and Tighten Clamps and Bolts

With your new exhaust system installed, take a look at the alignment and reposition any pipes or brackets if necessary. Tighten down all clamp bolts to secure the exhaust pipes.

Step 15: Tighten Exhaust Tip Bolts

Make sure the exhaust tips are aligned properly. Tighten down the bolts on both exhaust tips to secure them.

Congratulations! Your installation is finished.

Start Your S650 Mustang Mod Journey with a Refreshed Sound

With a new 2024 Mustang exhaust, you'll immediately notice an improvement in the exhaust sound when you start up the engine. Even though the 2024 Mustang is brand new, there are still plenty of other top S650 Mustang mods to upgrade its performance and style.

For example, adding lowering springs is a great way to enhance your Mustang’s stance and appearance. Check out our S650 Mustang lowering spring install guide to learn more. If you’re interested in further performance upgrades, find out if your S650 Mustang can be tuned to take the next step in customizing your ride. Check out more S650 Mustang parts for everything you need to achieve your build goals.