[10/10ths]

.....on my 2004 S, 3.2, stock engine, with stock headers and cats:

http://www.fvd.de/us/en/Porsche-0/2_7__180_kW-13-41/-/-/item/item_details/VID_24092723-VCD_15249219-gid_30-sort_4-display_50-item_BES98605000S/Tuning_-_Exhaust_-_Mufflers_BES98605000S_Sport_Muffler_`Brombacher`_ 986_S_Boxster__Sound_Version__Stainless_Steel__2x9 0mm.html

...And it is PERFECT.

No drone, yet sounds like a cup car when hard on the throttle.

With your mods, it might sound louder, but I think it will fix the drone problem.

Good luck!