Removing sound tube. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jeffs42885 · 06-19-2020, 10:38 AM

I'm going to be installing a perrin intake pipe on my 15 in a week. Just wondering, what plugs does everyone use to plug the hole that the tube comes in the car in the passenger side. I can't for the life of me find the reddit post, forum post..or whatever it was.

Thanks!

Wally86 · 06-19-2020, 11:19 AM

Quote:

Originally Posted by jeffs42885

I'm going to be installing a perrin intake pipe on my 15 in a week. Just wondering, what plugs does everyone use to plug the hole that the tube comes in the car in the passenger side. I can't for the life of me find the reddit post, forum post..or whatever it was.

Thanks!

A lot of posts say the 12v plug cap works just fine. Does the perrin not come with a plug for it?

Yoshoobaroo · 06-19-2020, 11:25 AM

I took the plastic piece that goes into the firewall and filled it with epoxy.

Ernest72 · 06-19-2020, 01:41 PM

Pretty sure mine came with a rubber cap, like a vacuum cap. It’s zip tied on the tube coming up from the firewall. You can remove that and plug it from the interior if you want.

Also I kept the resonator attached to the intake, most think it smooths out air or deals with back pressure for MAF.

Ohio Enthusiast · 06-19-2020, 02:34 PM

My Perrin intake came with a cap for the sound pipe that stays in the engine bay (right at the 90* elbow).

I don't see a need to also cap the hole in the firewall, but the 12v accessory cap from the glovebox does fit well there. Or you could take the 12v cap to the big box store and locate a plumbing plug with the same diameter and use that.

pope · 06-19-2020, 03:36 PM

I used a 1” plastic plug that perfectly fit the firewall hole after removing the sound tube grommet. I think you can find similar plugs in the fix-it section at auto parts stores; I happened to have a dozen or so in a bag.

Spawn_Of_Creation · 06-19-2020, 04:00 PM

3/4" plug from the plumbing section at your local hardware store

Ernest72 · 06-22-2020, 11:14 AM

Quote:

Originally Posted by Ohio Enthusiast

My Perrin intake came with a cap for the sound pipe that stays in the engine bay (right at the 90* elbow).

I don't see a need to also cap the hole in the firewall, but the 12v accessory cap from the glovebox does fit well there. Or you could take the 12v cap to the big box store and locate a plumbing plug with the same diameter and use that.

That what I have in my car. Works great.

06-19-2020, 10:38 AM	#1
jeffs42885 Senior Member Join Date: Jul 2013 Drives: Posts: 134 Thanks: 1 Thanked 14 Times in 13 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Removing sound tube. I'm going to be installing a perrin intake pipe on my 15 in a week. Just wondering, what plugs does everyone use to plug the hole that the tube comes in the car in the passenger side. I can't for the life of me find the reddit post, forum post..or whatever it was. Thanks!

06-19-2020, 02:34 PM	#5
Ohio Enthusiast Senior Member Join Date: Apr 2020 Drives: 2018 BRZ Location: Dayton, OH Posts: 1,045 Thanks: 1,477 Thanked 876 Times in 507 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	My Perrin intake came with a cap for the sound pipe that stays in the engine bay (right at the 90* elbow). I don't see a need to also cap the hole in the firewall, but the 12v accessory cap from the glovebox does fit well there. Or you could take the 12v cap to the big box store and locate a plumbing plug with the same diameter and use that. Attached Images Last edited by Ohio Enthusiast; 06-19-2020 at 02:46 PM.

06-19-2020, 03:36 PM	#6
pope has a funny hat Join Date: Feb 2020 Drives: 2014 BRZ Limited Location: MI Posts: 497 Thanks: 1,149 Thanked 631 Times in 281 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	I used a 1” plastic plug that perfectly fit the firewall hole after removing the sound tube grommet. I think you can find similar plugs in the fix-it section at auto parts stores; I happened to have a dozen or so in a bag. Attached Images

06-19-2020, 04:00 PM	#7
Spawn_Of_Creation Human Join Date: Jan 2016 Drives: 2015 BRZ Black Location: Dallas, TX Posts: 208 Thanks: 105 Thanked 102 Times in 67 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	3/4" plug from the plumbing section at your local hardware store Attached Images __________________ "Always listen to experts. They'll tell you what can't be done, and why. Then do it." - The Notebooks of Lazarus Long

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06-19-2020, 01:41 PM	#4
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,429 Thanks: 186 Thanked 776 Times in 446 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Pretty sure mine came with a rubber cap, like a vacuum cap. It’s zip tied on the tube coming up from the firewall. You can remove that and plug it from the interior if you want. Also I kept the resonator attached to the intake, most think it smooths out air or deals with back pressure for MAF.

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