Contact V & H, and ask them about the different back pressures of the 2 systems?
'04 VRSCB, SERF, Amsoil air filter & oil, Drilled Exhaust, Arlen Ness Mirrors, relocated Signals, Sundowner seat,
Tiger Racing belt guards, Pondo's pivot bolt covers & 'V' valve stem caps, Tyson's black riser and foot levers, Metzler ME 880's, black 5 spoke '08D wheels and rear pulley, Mini LED rear signals, Progressive suspension, Jeannie Guardian Bell!(so far!)
1978 Honda XL350 (w/4300 miles on it!)
Jedi:"It's free to be a member, but it'll cost your ass in the end..."