I have gone from the stock 2001 S muffler that came on the car to a 2003 S muffler modified by FDM (
FD Motorsports » Fister Exhaust – Boxster) to an OEM Porsche Sports Exhaust (PSE). The FDM had the best sound by far and I liked the larger tips. But, the PSE is special. I ended up deleting the secondary cats to get some sound out of the PSEs. No drone at all with the FDMs. The other two being stock also had no drone.