DIY / How to: 240sx Rear Bumper Exhaust Heat Shield Install

Another fairly straight forward write up, but I figured at least one person may be interested in it (I was looking for one to no avail these past couple of months). This is a rear bumper exhaust heat shield install onto an aftermarket 240sx coupe rear bumper, but should be applicable to fastbacks, s14′s, oem/aftermarket, and other cars.

The motivation for creating this heat shield came from my exhaust warping the stock rear bumper – and melting/bubbling the paint on my aftermarket rear bumper. This was mostly due to the overly rich tune from the ecu install, but it was easier for me to temporarily install a heat shield, which may be useful later as well, than to tap the downpipe & tune everything now.

I bought a sheet of aluminum (.090″ x 12″ x 24″) for just under $20 delivered via eBay. I got this thickness because I read about how some were too thin – this may actually be a little too thick for some applications, but worked fine for me. I held it down via 5/32″ long aluminum rivets & 1/8″ medium & short aluminum rivets (you may also get away w/ medium, and possibly short, 5/32″ aluminum rivets).

Total Project Time:
This took me about 2 hours taking my sweet ass time with the hand / hack saw & 30 minutes of which was spent going to Home Depot to pick up rivets since I forgot where I put my other pack of rivets from way back when.

Tools:
- Dremel, jigsaw, hack saw, or any other cutting tool you prefer
- Drill w/ 5/32″ & 1/8″ bits, or whatever size rivets you want to use
- Rivets & riveting tool
- Cardboard/paper for creating a template
- Aluminum sheet (again, mine was .090″ x 12″ x 24″)
- Dry erase marker or something to trace the template onto the aluminum
- Optional: I also used a section of aluminum heat shield barrier with adhesive (used for protecting areas in the engine bay from turbo installs)

00 - Tools 2

Step 1:
I found it much easier to remove the rear bumper than to work with it on the car.

01 - Bumper
Failed attempt of using purely aluminum heat barrier with adhesive (ripped off @ Horse Thief Mile & took some paint with it).

Step 2:
Create a basic template of what you want your shield to look like with cardboard or paper.

02 - Stencil

Step 3:
Once you are satisfied with your mock up, trace the design onto the aluminum sheet.

03 - Trace

Step 4:
Cut away! I first used a dremel with the jigsaw attachment, but I ended up using an old fashioned hack saw. After that, I smoothed the edges with the Dremel w/ sanding & deburring attachments.

05a - Grind

05b - More Grinding

Step 5:
Bend the aluminum sheet if necessary for your application. Then, test fit the sheet onto the bumper. At this point, you can drill pilot holes – drill onto the sheet first, then from there, drill through the bumper & place the rivets by hand to hold the position of the sheet.

06a - Better Fitting
06c - Tracing Inside Right
07 - Drill Holes
08a - Fit Rivets

Step 6:
Finish up by riveting. In my case, I added the optional heat barrier at the bottom of the bumper so that I didn’t have to bend the thick aluminum to cover that area.

08b - Rivet

Step 7:
Reinstall the bumper on the car. Take some pics and go “oooo, aaaaa”.

08c - Finished Riveting
09a - Side View
09b - Angle View
10a - Installed
10c - Installed
10e - Installed

Don’t mind the crooked rear bumper – just look at the heat shield, haha.

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4 Comments

  1. Wait, so why dont you just make the car not fire up the exhaust..instead of making the shield? haha

  2. why do people always jock other’s ideas? :hammer:
    Nice work.

  3. Are you the owner of that fucked up piece of shit from pimp my ride???hahahahahaahhahaahha

  4. Yes I am. You’re so funny.

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