- Increases the in-cabin rotor sound by up to 75%
- Foster SC Stage 4 Kit works on both closed air box and open filter or aftermarket CAI systems.
- Drilling through the firewall required.
- Connects from inlet pipe through the OEM sound tube location.
- Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin.
- For driver’s side supercharger inlets setups.