Factory Airbox Mod - Cobalt SS Network



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Old 03-30-2009, 11:36 PM   #1
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Factory Airbox Mod

We have been doing dozens of dyno pulls on our new SS/T trying out new parts and tuning in multiple combinations. After trying a few intake mods, I decided to modify the factory airbox. Here is a step by step inexpensive modification if anyone is interested:

The airbox inlet and fenderwell tube are shown here. The ID of the fenderwell tube necks down to about 2.5", and therefore becomes restrictive on high HP setups.


After removing the airbox, notch the plastic as shown:


Next, cut the fenderwell tube just before it starts to bend. Remove the plastic brackets from the tube. I cut all of the bracket off and it left a hole in the tube. You can leave some of the bracket on and avoid the hole. It will still fit fine in the new configuration.


With the airbox back in place, connect the fenderwell tube to the airbox using a 3.25" silicone coupler and 2 clamps.


Completed:





Method #2 without silicone coupler to connect snorkel:

Remove the headlight and then remove the headlight mounting bracket shown here-


Unplug the MAF sensor and remove the airbox lid:


Unbolt and remove the airbox:


Remove the snorkel bracket bolt shown to the right:


With the tire removed, you can more easily access the retainer clip behind the snorkel:


Cut off the long snorkel bracket as shown:


Cut the snorkel just before the first bend and smooth the edges:


Pic showing how the snorkel will slide into the lower airbox tube once the box is reinstalled:


With the airbox reinstalled, slide the snorkel up through the fenderwell. Use a screw to hold the pieces together:


K&N air filter installed:




Installing the AEM silicone intake:

Position the clamp on the turbo inlet for easy tightening as shown:


Connect the coupler to the airbox lid before fastening the lid to the airbox. This makes it easier to keep the coupler straight on the MAF housing:


Connect the airbox lid and fasten the clamps. Plug in the MAF sensor. Install the vent tube into the silicone coupler with the opening facing towards the MAF. Connect the vent tube assembly:

Last edited by Matt M; 10-02-2009 at 11:20 PM.
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Old 03-31-2009, 12:01 AM   #2
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Hey Matt,
Thats nice of you to post something like that as a vendor.

Looks like you extended the snorkle a few inches futher?? What differences has it made?
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Old 03-31-2009, 12:16 AM   #3
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Originally Posted by bri2203 View Post
Hey Matt,
Thats nice of you to post something like that as a vendor.

Looks like you extended the snorkle a few inches futher?? What differences has it made?
It is actually shortened a few inches. It normally curves forward and sits just behind the bumper skin.

We did a few mods to the stock intake and picked up over 10HP. I don't have numbers for this mod alone, but I'd guess it's worth a few HP.
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Old 03-31-2009, 01:07 AM   #4
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Damn... all I'm getting is

Anyway to repost the pics for me?

Anyone else having the same problem?
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Old 03-31-2009, 01:10 AM   #5
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X2 for no pics
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Old 03-31-2009, 01:34 AM   #6
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pics no work
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Old 03-31-2009, 01:37 AM   #7
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X3 for no pics
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Old 03-31-2009, 01:40 AM   #8
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they did work. I saw them before the first post. matt you must have moved the pics. From the pics it looked like in inlet flange of the air silencer attatched to the airbox
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Old 03-31-2009, 10:40 AM   #9
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Quote:
Originally Posted by Zander916 View Post
Damn... all I'm getting is

Anyway to repost the pics for me?

Anyone else having the same problem?
Yeah, they were working, but they migrated my website and they keep screwing everything up. I'll get them fixed this afternoon. Sorry.
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Old 03-31-2009, 10:43 AM   #10
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Yeah, they were working, but they migrated my website and they keep screwing everything up. I'll get them fixed this afternoon. Sorry.
pm when fixed? also times 2 on what the dyno dif was
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Old 03-31-2009, 12:39 PM   #11
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the pics don't work
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Old 03-31-2009, 01:16 PM   #12
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Quote:
Originally Posted by Matt M View Post
Yeah, they were working, but they migrated my website and they keep screwing everything up. I'll get them fixed this afternoon. Sorry.
Sounds good! I appreciate it!
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Old 03-31-2009, 01:18 PM   #13
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subd for working pics, sound intresting
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Old 03-31-2009, 05:07 PM   #14
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i can see pics just fine, the rest of u must be at work and has pics blocked by your IT guy
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Old 03-31-2009, 05:09 PM   #15
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i can see pics just fine, the rest of u must be at work and has pics blocked by your IT guy
Damm Proxies
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Old 03-31-2009, 05:10 PM   #16
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Pics are working now!
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Old 03-31-2009, 05:18 PM   #17
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Damm Proxies
the joys of not being chained to a desk
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Old 04-04-2009, 01:20 PM   #18
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THANK YOU MATT!!!

I just did the factory airbox mod. It was pretty easy and straightforward. It didn't take very long to do and only cost me a few dollars.

I'm tuned with K&N drop in and BPV spring upgrade. I'm not going to lie and say it was like night and day or something like that. But a difference was noticed.
I used to have a dead spot right around 6K rpm to 7K rpm where the rpm rise was noticeably slower. After the mod that dead spot is pretty much gone.

HUGE thanks to Matt who posted it!

It's weird that GM did that. It starts out 3"... necks down and then returns to 3"...
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Old 04-04-2009, 05:44 PM   #19
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why wouldn't you just remove the snorkel all together?
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Old 04-04-2009, 07:08 PM   #20
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Originally Posted by 08inBama View Post
why wouldn't you just remove the snorkel all together?
You could, and I gave that thought. But it would just be like a short ram pulling in air from the engine bay. It wasn't difficult at all to just do this and get cold air. It's really not hard at all. Didn't take very long either.
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Old 04-04-2009, 08:11 PM   #21
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Quote:
Originally Posted by Zander916 View Post
It's weird that GM did that. It starts out 3"... necks down and then returns to 3"...
kinda like the charge piping

bump for the OP, pics not showing anymore......
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Old 04-04-2009, 08:41 PM   #22
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Quote:
Originally Posted by 08inBama View Post
why wouldn't you just remove the snorkel all together?
Aside from drawing air from inside the fenderwell, the snorkel is also nice because it has a radiused inlet just like a velocity stack. This can improve airflow over a tube that just begins without a radius.

Quote:
Originally Posted by Zander916 View Post
THANK YOU MATT!!!

I just did the factory airbox mod. It was pretty easy and straightforward. It didn't take very long to do and only cost me a few dollars.

I'm tuned with K&N drop in and BPV spring upgrade. I'm not going to lie and say it was like night and day or something like that. But a difference was noticed.
I used to have a dead spot right around 6K rpm to 7K rpm where the rpm rise was noticeably slower. After the mod that dead spot is pretty much gone.

HUGE thanks to Matt who posted it!

It's weird that GM did that. It starts out 3"... necks down and then returns to 3"...
I'm glad you like this mod. It really is easy and we are still using it on our upgraded turbo. We also have the KN drop in.

Last edited by Matt M; 04-04-2009 at 08:41 PM. Reason: Automerged Doublepost
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Old 04-04-2009, 09:40 PM   #23
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can someone post a how to w/ pics please please
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Old 04-06-2009, 01:25 PM   #24
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Thumbs up

^^x2
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Old 04-17-2009, 11:30 PM   #25
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Pics are fixed. Sorry it took so long. My website company took a while to get the image issues straightened out.
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