MUSTANG GT 2005-2009 ROUSH DS STAGE 4 open filter inlet SOUND TUBE KIT 75% WHINE INCREASE SKU 130 Universal Kits No drilling through the firewall

No drilling through the firewall

but also the leap into electronic typesetting

Sealed sound tube with special diaphragm cap installed behind pedal

sometimes on purpose (injected humour and the like)

but opening the existing hole to 1/38” increases whine

MUSTANG GT 2005-2009 ROUSH DS STAGE 4 open filter inlet SOUND TUBE KIT 75% WHINE INCREASE SKU 130 Universal Kits No drilling through the firewallIncreases the in cabin rotor sound by up to 75% Foster SC Stage 2 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 drivers side supercharger inlets setups.