Chris Gemmel Team Kiefer
Christian Gemmel ,Team Kiefer is racing with BOS 2004 Grand Prix 250
  Sandro Cortese IDM 125
Sandro Cortese , Team Raudies Racing Is racing like last year the German championship 125 sponsored by BOS.
 

Team Kawasaki Docshop Racing
Kai Borre Anderson is racing for Team Kawasaki Docshop Racing with BOS in the Supersport 600.
  Suzuki Bridgestone GSXR Cup 2004
Suzuki Bridgestone GSXR 750 Cup is racing in 2004 again with BOS exhausts.
  Yamaha R6 Cup 2004
The Yamaha R6 Cup is again sponsored by BOS this year.