I also have the FVD Brombacher "Sound" exhaust. It was noticeably lighter, and my experience is exactly the same as Robert986. I've had the exhaust for over year now. Fit and finish was like factory - no issues whatsoever, and I stand by it. The exhaust was extremely well built. I personally would recommend the exhaust.
The only "drone" I can truly think of is when you are cruising under 3000rpm, and it's not what I personally would even consider a drone. I've had multiple people try my car out to see if they believed it was an annoying drone (or a drone at all) and nobody felt that it was.
Just a note - I have no header or catalytic converter modifications, only the exhaust, IPD plenum, and the throttle body upgrade. I didn't want any emissions-related problems and surprise check engine lights lighting up on my dashboard.
Here is a link to the 2000 - 2004 Boxster S and I think a "non-S" version of the exhaust:
https://www.fvd.net/us-en/BES98605000S/sport-muffler-986-boxster-s-2000-04-brombacher-edition-sound-version-dual-35-90-mm-tips.html
You'll need to search for your specific year and model to ensure proper fit as there are multiple versions of it. While you're at it, make sure you buy new installation hardware to install your exhaust. I don't recommend re-using your original hardware.
Happy new year to you all, and enjoy your cars in good health!