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G35 Cat-back exhaust

Why do it

Tools you'll need

• Jack and 4 jack stands
• Socket set
• Torque wrench
• Penetrating oil
• Pry bar
• 12, 14 and 17mm sockets
• Jack and 4 jack stands
• Socket set
• Torque wrench
• Penetrating oil
• Socket set
• Jack and 4 jack stands
• Socket set
• Torque wrench
• Penetrating oil
• Socket set

Starting out? See our budget tool list.

Parts to buy

• STILLEN cat-back 504360D (2003-2007 coupe) For the coupe.Fits 2003–2007 · coupe only
• STILLEN cat-back 504370 (2003-2006 sedan) For the sedan.Fits 2003–2006 · sedan only
• STILLEN cat-back 504375 (2007-2008 sedan) Fits RWD and AWD.Fits 2007–2008 · sedan only

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Steps

1. Soak the hangers

   • Spray all the rubber hangers.
   ▶ Watch this step (cat-back on a 2003-2007 G35 coupe) (0:30–0:45)

2. Remove the muffler section

   • Undo the ground wire and bolts, pry off the hangers and take the mufflers off.
   ▶ Watch this step (0:45–2:41)

3. Remove the mid pipe

   • Free the pipe from its hanger and undo the two nuts.
   ▶ Watch this step (2:41–3:22)

4. Fit the new mid pipe

   • Join the short pipes to it and tighten the nuts.
   ▶ Watch this step (3:22–4:46)

5. Fit the mufflers

   • Hang the mufflers, then refit the ground wire and tighten everything.
   ▶ Watch this step (4:46–6:30)

6. Remove the stock exhaust

   • Undo the bolts and pull it off its hangers.
   ▶ Watch this step (cat-back on a 2003 G35 sedan) (1:06–7:01)

7. Fit the new system

   • Hang the pipes and bolt them up.
   ▶ Watch this step (12:17–16:07)

8. Final adjustments

   • Line it up and tighten everything.
   ▶ Watch this step (16:07–19:46)

9. Remove the stock exhaust

   • Undo the bolts and pull it off its hangers.
   ▶ Watch this step (full exhaust on a 2008 G35 sedan) (2:08–4:21)

10. Fit the new system

    • Hang the pipes and bolt them up.
    ▶ Watch this step (4:21–7:33)

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.
• 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.