Ive got the same with Leo,s on my Ten must admit after fitting all this stuff the kev mod made the bike much smoother
but its no faster than my mates Std one, maybe a touch but not much, sounds much better thats for sure

__________________
My 5th XT660R Mods so far, K+N, Kev Mod, Yamaha Hand guards, Engine bars, Yam Sump guard, Yam Rack, Heated Grips, MT21s, Raised rear XTX dogbones, Front Raised with spacers, Extended Side Stand, Yam Touring Screen, Carbon fibre heel guards, CNC Short Levers, Snorkle Removed, 100W headlight bulbs, Rear pannier rack as rear crash bar CCC oval Cans, Zumo 660 +++