If anything I feel like mine got louder over time.. but that might just be me.... and i took out my secondary cats so it got louder due to that too.. i think ive read that other people's have gotten a little louder also
2007 Titanium Silver 328xi: FBO - headers. Upgraded suspension and brakes.
1985 Gazelle Beige 325e: Nursing it back to health from PO negligence.. Soon to be track car.