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MUSTANG GT500 2007-2009 WHIPPLE DS STAGE 4 open filter inlet SOUND TUBE KIT 75% WHINE INCREASE SKU 155



Smooth interior walled high heat resistant tubing

Rubber grommets for a tight seal and clean install

High heat resistant braided cut sleeve covers

Hose ends finished with marine grade thick walled adhesive heat shrink

All kits complete with Bi-metal drilling bits and detailed install guide










89 in stock


  • Increases the in-cabin rotor sound by up to 75%
  • Foster SC Stage 4 Kit works on both closed air box and open filter or aftermarket CAI systems.
  • Drilling through the firewall required.
  • Connects from inlet pipe through the OEM sound tube location.
  • Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin.
  • For driver’s side supercharger inlets setups.





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