SERRIA/SILVERADO 2014-UP WHIPPLE STAGE 4 INLET PATH whine mod kit 75% WHINE INCREASE SKU 597 other Drilling through the firewall is

Drilling through the firewall is required

Increases the in-cabin rotor sound by up to 50%

For customers who want to develop and fit the Foster SC Supercharger sound tube according to their own needs

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

Connects from inlet MAF housing induction pipe through the OEM sound tube location

SERRIA/SILVERADO 2014-UP WHIPPLE STAGE 4 INLET PATH whine mod kit 75% WHINE INCREASE SKU 597 other Drilling through the firewall isIncreases the in cabin rotor sound by up to 75% 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.