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Drilling through the firewall is required
You will need a portion of your stock sound tube for this installation
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Increases the in-cabin rotor sound by up to 25%
MUSTANG GT 2005-2009 WHIPPLE DS STAGE 4 open filter inlet SOUND TUBE KIT 75% WHINE INCREASE SKU 125 Universal Kits Drilling through the firewall isIncreases 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. No Stock sound tube required.
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