After the noise treatments in the doors, floor, and rear of the Camaro, I turned my attention to the firewall. These vehicles have a tube that runs from the engine intake pathway to the firewall, with a diaphragm to isolate airspace but allow sound to pass through. The solution is to 3D print two pieces that let you plug each of the holes – one at the firewall and one at the intake pathway, just before the throttle body. I printed these out of ABS.
The fire wall connection looks like this:
[img]https://hosting.photobucket.com/images/e128/phat_funky_beats/20240124_211949.jpg[img]
The hose connection at the intake pathway looks like this:
And the rubber hose clamps are easily opened and removed as they just use push-clips.
The diaphragm is held with T50 Torx bolts:
With the hose removed, you have this:
The result at the firewall is this piece with butyl gasketing:
The result at the intake pathway is this plug that fits perfectly:
The result is very noticeable. All of the intake noise is gone. The chugging noise from V4 mode is gone. The cabin is much more comfortable.