Originally Posted by dadealus
Installed the Akrapovic Evolution exhaust. I heard this system has little to no drone. Yet at 2k and at 3k RPMs I am getting seriously hardcore brain humming drone. any ideas?
The Akrapovic Evolution is one of the mildest full systems made for the E9X M3. Sound levels are a subjective thing so you may be a person who has a sensitive ear to volume. You may have to go back to the stock system because I doubt that you are going to find a quieter full system.