Si Stock airbox modified for cold air.

[davemarco]

With the resonator removed, there are still two bolts that hold up the stock airbox.

I looked back at some pictures and realized that there is in fact a bracket that I had removed. I might be throwing back on the stock intake for a bit to compare, as I periodically feel like my CAI is making less power than the stock air box did

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[ApexEight]

I looked back at some pictures and realized that there is in fact a bracket that I had removed. I might be throwing back on the stock intake for a bit to compare, as I periodically feel like my CAI is making less power than the stock air box did

Which CAI?

 

[davemarco]

Which CAI?

PRL Cobra. The only evidence that I have that something is off is admittedly pretty thin:

- I'm running slightly rich, with my post install Long Term Fuel Trims going from 0 to a consistent -3 to -5 at idle, I know that this is not dangerous - I'm more interested in why an intake with a larger diameter would seemingly result in less air getting through (based on the suddenly negative trims).

- From day one following my installation, I've felt a slight reduction in the immediacy of my acceleration. It feels almost like the car is now lugging at RPM's where it was previously happy at, and is slower to accelerate at RPM's where I'm hitting boost. This lugging feeling could be from the increased NVH that I'm feeling following my install rather than actual lugging, so I'm not sure.

- Every other Cobra CAI user seems to report a noticeable increase in power. How could I be the only one to feel to the contrary, unless something is off?

EDIT: I bit the bullet and e-mailed PRL on this. I hate bothering them again (especially after bugging them so much for my intercooler install), but I feel like I'm the only one not absolutely loving my Cobra CAI. I desperately want this to change, so if there's any possibility that I might've done something incorrectly during my install, I want to know.

 

[jmr]

I would not bother removing the resonator unless you want to free up space or reduce weight.
All I did was to put Black duct tape over the hole inside the airbox going to the resonator and now it's not part of the airbox air flow.

 

[ApexEight]

I would not bother removing the resonator unless you want to free up space or reduce weight.
All I did was to put Black duct tape over the hole inside the airbox going to the resonator and now it's not part of the airbox air flow.

For like structural integrity reasons? Are the two bolts not enough to hold it up without the resonator?

 

[odinist]

I would not bother removing the resonator unless you want to free up space or reduce weight.

With the resonator in place, it would be impossible to run a tube from the bottom of the airbox to the cool air location; the resonator has to be removed for this mod.

 

[odinist]

Did a bit more on this mod over the weekend. Inspired by @maddmatt02 I cut holes in the fake vent to allow more air to pass through to the location from whence the intake is drawing air. I matched them up to the holes on the passenger side for the horn to keep things symmetrical (though I do need to go back with my Dremel and clean them up a bit).

Results are great! Even in city traffic I'm a few degrees closer to ambient than I was previously, and I've noticed that the temps drop significantly quicker once I start moving from a red light.

 

[VooDuuChild]

Did a bit more on this mod over the weekend. Inspired by @maddmatt02 I cut holes in the fake vent to allow more air to pass through to the location from whence the intake is drawing air. I matched them up to the holes on the passenger side for the horn to keep things symmetrical (though I do need to go back with my Dremel and clean them up a bit).

Results are great! Even in city traffic I'm a few degrees closer to ambient than I was previously, and I've noticed that the temps drop significantly quicker once I start moving from a red light.

Finally someone did this, nice. What I'd like to know, is there any way to actually run some ducting to further direct air to the problem areas from these fake vents. Unfortunately, I won't be able to do anything like this for a while myself considering I have a broken shoulder. Good job....looks great.

 

[odinist]

Finally someone did this, nice. What I'd like to know, is there any way to actually run some ducting to further direct air to the problem areas from these fake vents. Unfortunately, I won't be able to do anything like this for a while myself considering I have a broken shoulder. Good job....looks great.

Thanks!

Yeah, the tube I have down there still has enough length left that if I wasn't lazy and popped off the splash guards I could optimally position it to be right at the new intakes holes. But, lazy.

 

[ApexEight]

Thanks!

Yeah, the tube I have down there still has enough length left that if I wasn't lazy and popped off the splash guards I could optimally position it to be right at the new intakes holes. But, lazy.

Do you know the overall length over that Spectre hose that you linked in your OP? Did you have to trim off any to fit it?

 

[odinist]

Do you know the overall length over that Spectre hose that you linked in your OP? Did you have to trim off any to fit it?

I think it's a bit over two feet? I didn't have to cut any, though.

 

[SUL73NAZ]

 

[Myx]

Thanks for posting. I was going to do this myself but that plastic is pretty darn thick. Started to try to cut holes in the piece I purchased but don't have the proper tools to do this safely.

 

[peters239]

Did a bit more on this mod over the weekend. Inspired by @maddmatt02 I cut holes in the fake vent to allow more air to pass through to the location from whence the intake is drawing air. I matched them up to the holes on the passenger side for the horn to keep things symmetrical (though I do need to go back with my Dremel and clean them up a bit).

Results are great! Even in city traffic I'm a few degrees closer to ambient than I was previously, and I've noticed that the temps drop significantly quicker once I start moving from a red light.

Just did this too. Thanks for the original post which made me start modding my stock intake. The hatchback sports box though is alittle different to work with because its not this nice big flat box. I also used smooth piping thinking it would help with smoothing out the air flow to get more cold air up there and also help with some more sound from the turbo. Sound wise i am alittle disappointed. I have stock filter so i hope that by buying stage prl stage one kit will help with alittle more sound or when i get a ktuner because of pushing more boost.

For anyone thinking about rain issues getting up in the box it rained again here in pa and i was driving 60mph and flooring it and when i got home i took filter out and nothing in the box or tube. When i looked in the vent in the bumper everything is wet like the other side for the horn but i angled the pipe away from the opening so it doesnt get a direct hit from the water.

 

[ApexEight]

@peters239 what are those four holes drilled in the box for?

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