I haven't heard the Gintani sport system, but BarryC says the the Gintani sport + xpipe/HFC has less drone than the Eisenmann Sport.
My Remus drone's is a tolerable but if you are always going up hills in 6th at 70-75mph, I would not recommend getting it. Actually many exhausts sadly drone right around this level, and it's just how intense or how much it drones is what matters. The mufflers that I know do not drone are the Dinan, OEM, or Akrapovic.
I would think AA doesn't drone due to their NCC's, but people say the AA's still really loud so I'm not sure if that means it's droning or just it's loud.
2009 E92 M3 | Alpine White | Black Extended | Advan RS | Turner Test Pipes | Dinan Axle-Back | OETuning | Eibach Springs | UUC SSK | VRS Front Lip | VRS Type I Diffuser | Matte Black | RPi Scoops | MS Filter | Yokohama AD08 | F1 Pinnacle
Special Thanks: Gintani | OETuning | eAs