F-150 2010 & UP E-FORCE STAGE 4 Inlet path SOUND TUBE KIT 100% WHINE INCREASE SKU 185 UNK but opening the existing hole

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

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

but also the leap into electronic typesetting

Connects from inlet pipe pipe to the OEM sound tube location

Various versions have evolved over the years

F-150 2010 & UP E-FORCE STAGE 4 Inlet path SOUND TUBE KIT 100% WHINE INCREASE SKU 185 UNK but opening the existing holeIncreases the in cabin rotor sound by up to 100% Drilling through the firewall required (bit provided) Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin. Connects from inlet MAF housing induction pipe through the drilled firewall location. No Stock sound tube required.