One of the best parts of the FKM system is the ability to change your truck’s "voice." Here is how to operate the 3-stage valve:
This standout feature allows you to switch between different exhaust tones— Sidepipe , Stock , and Stacks —on the fly while driving. Scania L6 & V8 Open pipe with FKM system 1.46
Press again quickly (do not hold) to cycle through the tones. One of the best parts of the FKM