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G37 Cat-back exhaust

Why do it

Tools you'll need

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

Starting out? See our budget tool list.

Parts to buy

• STILLEN cat-back 504402 (2008-2013 coupe) For the coupe.Fits 2008–2013 · coupe only
• STILLEN cat-back 504377 (2009-2013 sedan) For the sedan. The same exhaust as our video.Fits 2009–2013 · sedan only

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

   • Undo the bolts and slide it off its hangers.
   ▶ Watch this step (Tomei exhaust on a G37) (1:31–4:27)

2. Fit the new system

   • Hang the pipes and bolt them up.
   ▶ Watch this step (4:27–7:03)

3. Final adjustments

   • Line up the tips and tighten everything.
   ▶ Watch this step (7:03–8:21)

4. Remove the muffler

   • Take off the factory muffler.
   ▶ Watch this step (STILLEN on a G37 sedan) (0:27–1:01)

5. Undo the bolts

   • Undo the flange bolts.
   ▶ Watch this step (1:01–2:42)

6. Free the hangers

   • Pull the exhaust off its rubber hangers.
   ▶ Watch this step (2:42–3:50)

7. Remove the crossmember and mid pipe

   • Unbolt the crossmember and take the mid pipe off.
   ▶ Watch this step (3:50–4:56)

8. Fit the new exhaust

   • Hang the new pipes and tighten them.
   ▶ Watch the install (axle-back on a G37 sedan) (11:51–16:51)

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.