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Mustang Cat-back exhaust

Why do it

Tools you'll need

• Jack and 4 jack stands
• Socket set
• Torque wrench
• Penetrating oil
• Jack and 4 jack stands
• Socket set
• Torque wrench
• Penetrating oil

Starting out? See our budget tool list.

Parts to buy

• Borla S-Type 140629BC (15-17 GT Fastback) For the Fastback.Fits 2015–2017 · Fastback only · gt15
• SLP Loudmouth (99-04 GT) The same exhaust as our video.Fits 1999–2004 · gt2

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Steps

1. Remove the old exhaust

   • Take off the tail pipes.
   ▶ Watch this step (cat-back on a 15-17 GT) (2:16–3:55)

2. Refit the factory pieces

   • Move the factory parts over.
   ▶ Watch this step (3:55–4:38)

3. Fit the hanger and clamps

   • Fit the hanger and tighten the clamps.
   ▶ Watch this step (4:38–4:53)

4. Fit the mufflers

   • Fit the mufflers.
   ▶ Watch this step (4:53–7:38)

5. Fit the SLP system

   • Take off the stock parts and start the new system.
   ▶ Watch this step (SLP on an SN95) (1:02–1:38)

6. Fit the resonator

   • Fit it.
   ▶ Watch this step (1:38–2:23)

7. Fit the tips

   • Fit the tips.
   ▶ Watch this step (2:23–3:13)

8. Fit the pipes

   • Fit the pipes and tighten everything.
   ▶ Watch this step (3:13–4:13)

How to know it worked

• No exhaust leaks at the joints.
• Tips sit even in the bumper.
• Nothing touches the body.
• No exhaust leaks at the joints.
• Tips sit even in the bumper.
• Nothing touches the body.

Follow your part's instructions and your service manual's torque specs.