2016-2019 Camaro ZL1 Stage 1 Closed Airbox Sound Tube Installation Guide SKU 327 331

2016 - 2019 ZL1 Camaro

Closed Airbox stage 1 Sound Tube Installation Guide SKU 327,331

This kit offers higher levels of rotor sound (whine) within the cabin due to the direct path from inlet to the firewall. This Kit requires the airbox to be drilled for connection from the airbox to the stock OEM sound tube hole in the firewall.
  1. 1 x 1 3/4” hole saw
  2. 1 x 1" 90 degree hose barb
  3. 1 x Rubber grommets
  4. 1 x Large rubber washer
  5. 1 x Blade
  6. Sound Tube

The 2016-2018 Camaro came with a OEM sound tube system, on the ZL1 model the sound tube was deleted and a plug was used in the firewall hole the sound tube connected to. Remove this plug by unscrewing the small nut off the stud and pulling the plug cap off. This exposed the hole that will be used for the Foster SC sound tube kit.

With provided 1 ¾” hole saw drill bit, drill a hole in the marked location on the airbox and install the large rubber grommet. Either remove the lid for drilling or if drill in place make sure to remove or cover panel filter to catch plastic filings from the drilling process. Also make sure to clean out any filings from the intake path with vacuum. Insert the large grommet (supplied) into the drilled hole in the air box to secure the sound tube. Push the grommet into position into the hole using WD40 for lubrication. Image shows rubber grommet in 1 ¾” airbox hole. Insert the larger end of the supplied sound tube into the rubber grommet using WD40 (pinch the tube ends to help compress it into the tight fitting rubber grommet) so approx. 1” extends through into the box. If the sound tube end has electrical tape to narrow the tube for installation you can remove the tape once through the grommet. Inside view of sound tube installed airbox and grommet. Remove Electrical tape once installed. Electrical tape used to narrow the end of tube for installation through the airbox grommet. Remove tape once installed. With black RTV silicone make a nice continues bead around the hole like on the picture below (red circle is a reference mark for the RTV) keep in mind the size of the large rubber washer when doing so. With the rubber washer on the short end of the 90 fitting Insert the 90 fitting with washer into the hole keeping the barbed end pointing towards the driver side. From the inside of the car under the dash about a foot above the gas pedal you will see the fitting coming through the firewall. Push the small rubber grommet with RTV silicone on the inside over the fitting and seat it to the firewall. You may need to have an extra set of hands to hold the fitting on the other side or wedge something to hold it in place while installing the grommet from the inside. Wipe excess RTV silicone from around the washer and tape in place and let dry for 12 hours to cure and secure the fitting in place. From the inside of the car under the dash about a foot above the gas pedal you will see the fitting coming through the firewall. Push the small rubber grommet with RTV silicone on the inside over the fitting and seat it to the firewall. You may need to have an extra set of hands to hold the fitting on the other side or wedge something to hold it in place while installing the grommet from the inside. Wipe excess RTV silicone from around the washer and tape in place and let dry for 12 hours to cure and secure the fitting in place. After the silicone is dry, use light grease or WD40 inside the end of sound tube and while holding the fitting push the sound tube end over the ribs completely seating the hose on the fitting. Use the extra zip tie to secure the sound tube as needed.
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