add_filter( 'the_title', 'custom_product_visor', 10, 2 );
function custom_product_visor( $title, $post_id ){
    $post_type = get_post_field( 'post_type', $post_id, true ); 
    if ( is_single() ){
    if( in_array( $post_type, array( 'product', 'product_variation') ) ) {
        $search = 'BOW||';
        $replace = '<span class="visor"></span>';
        $title = str_replace($search, $replace, $title );
    }
}
    return $title;
}