MUSTANG GT500 2007-2009 WHIPPLE DS STAGE 4 open filter inlet whine mod kit 75% WHINE INCREASE SKU 155 Universal Kits sometimes by accident

sometimes by accident

No drilling through the firewall

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Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin

MUSTANG GT500 2007-2009 WHIPPLE DS STAGE 4 open filter inlet whine mod kit 75% WHINE INCREASE SKU 155 Universal Kits sometimes by accidentIncreases 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 drivers side supercharger inlets setups.