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%

Foster SC Stage 2 Kit works on both closed air box and open filter or aftermarket CAI systems

Sealed sound tube with special diaphragm cap installed behind pedal

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.