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Old 08-26-2013, 12:07 PM   #1
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JLT cold air intake

I've been seeing a few websites that sell JLT cai's that for automatic mustangs, you need to drill a hole in the induction tube. Does anyone know why you would have to do this? Where exactly would you have to drill the hole? And would it hurt it you didn't drill a hole at all?
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Old 08-26-2013, 12:45 PM   #2
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Drill it anywhere roughly in the middle. It is for the extra vacuum line that MTs do not require. You will need a grommet and a fitting that fits the vacuum line. The fitting on the factory CAI is part of the intake tube (it breaks off easy, BTW).
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Old 08-26-2013, 01:19 PM   #3
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Drill it anywhere roughly in the middle. It is for the extra vacuum line that MTs do not require. You will need a grommet and a fitting that fits the vacuum line. The fitting on the factory CAI is part of the intake tube (it breaks off easy, BTW).
Ahh i found the instructions off the website that shows me exactly where to drill. What would happen if someone didn't drill the hole? Is it that important? I'm just curious haha
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Old 08-26-2013, 01:27 PM   #4
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I have one for sell in the classified section

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Ahh i found the instructions off the website that shows me exactly where to drill. What would happen if someone didn't drill the hole? Is it that important? I'm just curious haha
My personal feeling is that if it's meant to be install then that's what needs to be done. To save in all that hassle you could just buy mine....LOL

Seriously though, the only reason I'm selling my is that I want a chrome CAI to finish off my chrome ascents under my hood.
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Old 08-26-2013, 01:50 PM   #5
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idk but I bet it would be angry if you didn't drill the hole. I guess it's something with shifting as it's an automatic only thing.

+1 on used!!!!
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Old 08-26-2013, 01:53 PM   #6
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My personal feeling is that if it's meant to be install then that's what needs to be done. To save in all that hassle you could just buy mine....LOL

Seriously though, the only reason I'm selling my is that I want a chrome CAI to finish off my chrome ascents under my hood.
Yeah I feel the same way. And I just bough a used one a few days ago lol
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Old 08-26-2013, 01:59 PM   #7
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Yeah I feel the same way. And I just bough a used one a few days ago lol
Dang it LOL
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Old 08-26-2013, 02:49 PM   #8
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What would happen if someone didn't drill the hole? Is it that important?

The vacuum is what allows the transmission to properly shift.
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Old 08-26-2013, 06:26 PM   #9
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What would happen if someone didn't drill the hole? Is it that important?

The vacuum is what allows the transmission to properly shift.
Thanks lol
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Old 08-26-2013, 07:03 PM   #10
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I ran mine capped off for one day. I had a mental lapse and deleted it the day before I did my JPC breather kit install...thinking it was part of the pcv. Somehow I got it in my head it connected to the pcv which it does not of course. I guess I'm getting older? Anyway, someone pointed it out after I posted a pic of the results and right after they did I thought to myself "Why did I do that?". I drove it for a day like that. I didn't notice any changes in shifting behavior.

Actually my laymay's thinking on the engineering reason...Possibly due to different TB closing rates on the manual or automatic and pressure changes between the intake pcv hose and CAI side of the hose?? Pure guess. Something to do with the brakes I'm thinking as there is no sensor in between the CAI fitting and the upper intake manifold, or the brake booster.
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