Pirates post your keyboards

Is your windbooster 11? do you stop using regular booster with that? o_o

Knuckles are Fast (5).
Booster alone raises the speed to Faster (3).
1-10 Wind Booster alone raises the speed to Fast (4).
11-20 Wind Booster alone raises the speed to Faster (3).
Booster+Any Wind Booster raises the speed to Faster (2).

So no, you would still use reg booster.