2015-2020 Stage 2 Whipple & Roush Foster SC to OEM Sound Tube Installation Guide SKU 455,461,465,470,877,977,1125,1200


Stage 2 Whipple, Roush, E-force Foster SC to OEM

Sound Tube Installation

SKU 455,461,465,470,877,


This upper kit offers increased levels of rotor sound (whine) within the cabin but does not require drilling through the firewall.

Connects to the OE cut sound tube at the firewall.

Connects to the OE cut sound tube at the firewall.

  1. Upper Sound tube
  2. 1 1/4” hole saw
  3. 3 nylon spacers
  4. Blade
  5. 6mm nut
  6. Small diaphragm cap
  7. Small grommet
  8. Straight hose barb
Cut the OE sound tube in the middle at the point of the yellow line (see image). Install in the stock location using the supplied 6mm nut. Note this can also be cut in place with small saw or razor clippers.

The OEM sound tube will have either a white or black foam baffle that needs to be removed before diaphragm cap install.

Remove the 3, 10mm nuts from the accelerator pedal and remove the pedal. Once pedal is removed cut around the opening of the sound tube entry hole (see diagram) using the supplied blade. Check that the sound tube seal lips are completely inside the firewall and completely pulled all the way through the firewall. If necessary use a small flathead screwdriver and a pair of needle nosed pliers to pull them through over the firewall. Place the supplied 3/8”nylon spacers on the studs & attach pedal. Push the small diaphragm into the sound tube and completely seat it. The clear membrane film should be on the outside. Be sure not to puncture the film as the diaphragm cap and clear membrane are designed to seal the sound tube and inlet pipe from debris or air entering the sound tube and inlet path. Note running without sound tube sealed with diaphragm cap will result in unmetered air entering the inlet path.

Diaphragm cap installed

Diaphragm cap installed

With supplied step drill locate on the opposite side of the MAF and mark 1” from the end of the inlet pipe lip and between the 2 holes on the mounting lip. Drill hole with supplied bit per video above. Clean the edges with a razor or sand paper then install the smaller of the 2 grommets into the hole, making sure it’s completely seated.

Mark and drill 1” from the flange edge

Mark and drill in center of the 2 bolt holes on the flange edge.

After rubber Grommet is installed push the 1” hose barb ( new hose barb is black) into the grommet from the inside with supplied grease to help seat and seal.

Before the MAF housing is installed and bolted back to the air box push the sound tubes smaller end over the hose barb while holding the hose barb fitting from inside. Fully seat the sound tube so it’s completely compressed against the housing and grommet. Supplied grease will help in seating the sound tube to the hose barb. This step needs to be done before the Whipple curved plastic elbow is replaced.

Reinstall the inlet elbow and clamps with Sound tube attached, and then install the sound tube over the hard-plastic OEM tube previously cut and installed into the firewall in Step 1.

Use supplied grease or a soap & water solution to facilitate the fit.

This is friction fit secure with supplied zip tie.

The installed upper sound tube is now visible in the image and the install is now complete.

We appreciate your business and hope you enjoy the increased rotor whine!

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