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sometimes on purpose (injected humour and the like)
but opening the existing hole to 1/38” increases whine
Various versions have evolved over the years
No drilling through the firewall required
Connects from inlet pipe pipe to the OEM sound tube location
F-150 2010 & UP E-FORCE STAGE 4 Inlet path SOUND TUBE KIT 100% WHINE INCREASE SKU 185 UNK sometimes on purpose (injected humourIncreases 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.
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