F-150 2010 & UP E-FORCE STAGE 4 Inlet path SOUND TUBE KIT 100% WHINE INCREASE SKU 185 UNK Drilling through the firewall is

Drilling through the firewall is required

Increases the in-cabin rotor sound by up to 75%

Connects from inlet MAF housing induction pipe through the drilled firewall location

sometimes on purpose (injected humour and the like)

F-150 2010 & UP E-FORCE STAGE 4 Inlet path SOUND TUBE KIT 100% WHINE INCREASE SKU 185 UNK Drilling through the firewall isIncreases 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.