player addAction [ "NITRO", { _vcl = vehicle player; if(_vcl == player)exitwith{}; _nos = _vcl getvariable "nitro"; _supgrade = _vcl getvariable "supgrade"; if(isEngineOn _vcl) then { switch (_this) do { case 17: { if(isEngineOn _vcl and !isnil "_supgrade") then { _vcl SetVelocity [(velocity _vcl select 0) * 1.011, (velocity _vcl select 1) *1.011, (velocity _vcl select 2) * 0.99]; } else { _vcl setvariable ["supgrade", 1, true]; }; }; case 42: { if(isEngineOn _vcl and !isnil "_nos") then { _vcl setVelocity [(velocity _vcl select 0) * 1.01, (velocity _vcl select 1) * 1.01, (velocity _vcl select 2) * 0.99]; } else { _vcl setvariable ["nitro", 1, true]; }; }; }; }; } ];