Something

public OnPlayerCommandText(playerid, cmdtext[])
{
	if(strcmp(cmdtext, "/nitro", true, 6)==0)
	{
	    if(GetPlayerState(playerid)!=PLAYER_STATE_DRIVER) return 0;
	    switch(GetVehicleModel(GetPlayerVehicleID(playerid)))
	    {
		    case 581,509,481,462,521,463,510,522,461,448,471,468,456: // Bikes
			SendClientMessage(playerid,0xFFFFFF,"Can't get nitro on a bike! ;P");
			case 592,577,511,512,593,520,553,476,519,460,513: // Planes
			SendClientMessage(playerid,0xFFFFFF,"Can't get nitro in a plane! ;P");
			case 472,473,493,595,484,430,453,452,446,454: // Boats
			SendClientMessage(playerid,0xFFFFFF,"Can't get nitro on a boat! ;P");
			case 548,425,417,487,488,497,563,447,469: // Helecopters
			SendClientMessage(playerid,0xFFFFFF,"Can't get nitro in helecorpters! ;P");
			case 441,464,465,501,564,594: // RC 
			SendClientMessage(playerid,0xFFFFFF,"Can't use nitro on an RC! ;P");
			case 538,537,449: // Trains
			SendClientMessage(playerid,0xFFFFFF,"Can't get nitro on a train! ;P");
		    default:
		    {
		    SendClientMessage(playerid,0xFFFFFF,"NITROUS OXIDE (N2O) JUST KICKED IN YO!");
			AddVehicleComponent(GetPlayerVehicleID(playerid), 1010);
			}
	   	}
    	return 1;
	}
}