主循环，使用Meta Data过滤？

I have the following loop, and I am trying to filter this based on a couple values, so that the loop can be more specific to each selection.

<div class="film-list">
    <?php $loop = new WP_Query( array( 'post_type' => 'drama', 'posts_per_page' => -1, 'category' => 'current' ) ); ?><?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
    <?php                              
         $post_id = get_the_id();
         $data['episode'] = get_post_meta($post_id, "episode",true);
         $data['released'] = get_post_meta($post_id, "released",true);
         $data['type'] = get_post_meta($post_id, "type",true);
         $data['series'] = strip_tags( get_the_term_list( $wp_query->post->ID, 'drama_category', '', ', ', '' ) );                               
     ?>
    <div class="item">
        <div class="inner">
            <a class="poster" href="<?php the_permalink(); ?>"><img alt="<?php print $data['series']; print $data['type']; ?>" src="<?php print   $feat_image = wp_get_attachment_url(get_post_thumbnail_id($post->ID)); ?>">
                      <div class="status">
                        <div class="dub">
                          <?php print $data['type']; ?>
                        </div><span class="bar"></span>
                        <div class="ep">
                          <?php print $data['episode']; ?>
                        </div>
                      </div></a>
            <a class="name" data-jtitle="<?php print $data['series']; print $data['type']; ?>" href="<?php the_permalink(); ?>">
                <?php print $data['series']; print ' ('; print $data['type']; print ')'; ?>
            </a>
        </div>
    </div>
    <?php endwhile; wp_reset_query(); ?>
</div>

The above code is a displaying the results within the custom post_type of drama and working flawlessly, however I am wondering how I can make my loop filter for only post which contain data of a specific lettering inside the $data['type'] portion.

For example

if (strpos($data['type'], 'dub') !== false) {
    // run our loop as normal displaying 20 - 30 results 
   // (whatever our limitation on post_per_page is, this doesn't work but it gives you a better idea of what I want
}