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Foster SC Stage 4 Kit works on both closed air box and open filter or aftermarket CAI systems
No drilling through the firewall
Connects from inlet induction pipe through the drilled firewall location
but opening the existing hole to 1/38” increases whine
Drilling through the firewall required
MUSTANG GT & GT350 2015-2017 WHIPPLE STAGE 2 INLET PATH SOUND TUBE KIT 50% WHINE INCREASE SKU 1205 GT Foster SC Stage 4 KitIncreases the in cabin rotor sound by up to 50% Foster SC Kit couples with part of the stock sound tubes makes installation easy No drilling through the firewall Sealed sound tube with special diaphragm cap installed behind pedal. Pedal spacers provided lifts pedal and improves heal to toe control Connects from inlet MAF housing induction pipe through the OEM sound tube location.