First, I installed the Berk CBE and drove it for a while. The sound was a little less than I wanted, so a few months later, I installed their HFC and man, what a difference :happydance: . The exhaust has a nice rumble now and has a nice mellow sound on the freeway. Now, when I "get on it", the sound is amazing, but not so loud that it is obnoxious. To me, it is the perfect combination of power, sound and performance.