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This seems to be a common question. :)

If you dont want to alter the laser driver, you can use the laser_filters package as you already guessed.

Example of how to use this:

<launch>
  <node pkg="laser_filters" type="scan_to_scan_filter_chain"
      name="laser_filter">
    <rosparam command="load" file="laserscan_filter.yaml" />
  </node>
</launch>

With laserscan_filter.yaml containing:

scan_filter_chain:
- name: laser_cutoff
  type: laser_filters/LaserScanAngularBoundsFilter
  params:
    lower_angle: -1.60876090527
    upper_angle: 1.60876090527