Making a cold air box
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There is no set way to make a cold box. This is simply an example. You can lay your PCM on it'* side, or leave it where it is. Each year will have differences. Move what you can and put your filter where you want it. Making a custom box will save you a lot of money. Again, this is only a example, you will need to make adjustments.
Here is the area I cleared for the air box. Most of this came from the removal of the stock air box.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020117.jpg)
Use some cardboard to make a template, then transfer that to 1/8" Plexiglas. Start with the bottom.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020118.jpg)
Then move on to the side. Watch for clearance of wires, hoses, and hood release. This shows the cone filter placement.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020119.jpg)
Use angle braces and small bolts to hold each joint in place. Once this part is all aligned you can move on.
Now make a template for the back portion that the filter will pass threw. make sure you get a tight fit here.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020120.jpg)
Here the box has been removed from the car to make working easier. I added the last small piece to finish the outside of the box. I also used a little thread lock on the bolts. I made sure all joints are lined up right and then tightened all bolts.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020121.jpg)
I then removed the protective masking from the Plexiglas and placed the box in place. I then used a angle brace to mount it to the body of the car.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020122.jpg)
Check all alignments so your work looks good and fits properly.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020123.jpg)
Now make a template for the lid. Do a good job here, this will be what everyone sees. It will also be what holds everything rigid.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020124.jpg)
![](https://www.gmforum.com/howto/tech-info/t280372/P4020125.jpg)
![](https://www.gmforum.com/howto/tech-info/t280372/P4020126.jpg)
This MOD will run you under $40 or $50 not including the filter. I used a dremal with a cut off wheel to cut the Plexiglas, and a sanding drum to clean up the cuts. This was a few hours of easy work.
Gives a nice clean look to the engine bay.
Here is the area I cleared for the air box. Most of this came from the removal of the stock air box.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020117.jpg)
Use some cardboard to make a template, then transfer that to 1/8" Plexiglas. Start with the bottom.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020118.jpg)
Then move on to the side. Watch for clearance of wires, hoses, and hood release. This shows the cone filter placement.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020119.jpg)
Use angle braces and small bolts to hold each joint in place. Once this part is all aligned you can move on.
Now make a template for the back portion that the filter will pass threw. make sure you get a tight fit here.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020120.jpg)
Here the box has been removed from the car to make working easier. I added the last small piece to finish the outside of the box. I also used a little thread lock on the bolts. I made sure all joints are lined up right and then tightened all bolts.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020121.jpg)
I then removed the protective masking from the Plexiglas and placed the box in place. I then used a angle brace to mount it to the body of the car.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020122.jpg)
Check all alignments so your work looks good and fits properly.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020123.jpg)
Now make a template for the lid. Do a good job here, this will be what everyone sees. It will also be what holds everything rigid.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020124.jpg)
![](https://www.gmforum.com/howto/tech-info/t280372/P4020125.jpg)
![](https://www.gmforum.com/howto/tech-info/t280372/P4020126.jpg)
This MOD will run you under $40 or $50 not including the filter. I used a dremal with a cut off wheel to cut the Plexiglas, and a sanding drum to clean up the cuts. This was a few hours of easy work.
Gives a nice clean look to the engine bay.
![](https://www.gmforum.com/howto/tech-info/t280372/P4020127.jpg)
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I Have been searching for a cold air box for my SSEI. Doesn't anyone make these, or do you have to make a homemade one like what you did here?
Thanks for your response.
Thanks for your response.
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