diff -u b/core/lib/Drupal/Core/Config/ConfigFactoryOverrideInterface.php b/core/lib/Drupal/Core/Config/ConfigFactoryOverrideInterface.php
--- b/core/lib/Drupal/Core/Config/ConfigFactoryOverrideInterface.php
+++ b/core/lib/Drupal/Core/Config/ConfigFactoryOverrideInterface.php
@@ -33,7 +33,20 @@
   public function getCacheSuffix();
 
   /**
-   * Gets a configuration object for the override.
+   * Creates a configuration object for use during install and synchronization.
+   *
+   * If the overrider stores it's overrides in configuration collections then
+   * it can have its own implementation of
+   * \Drupal\Core\Config\StorableConfigBase. Configuration overrider's can link
+   * themselves to a configuration collection by listening to the
+   * \Drupal\Core\Config\ConfigEvents::COLLECTION_INFO event and adding the
+   * collections they are responsible for. Doing this will allow installation
+   * and synchronization to use the overrider's implementation of
+   * StorableConfigBase.
+   *
+   * @see \Drupal\Core\Config\ConfigCollectionInfo
+   * @see \Drupal\Core\Config\ConfigImporter::importConfig()
+   * @see \Drupal\Core\Config\ConfigInstaller::createConfiguration()
    *
    * @param string $name
    *   The configuration object name.
diff -u b/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
--- b/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -896,7 +896,15 @@
    *   The name of the configuration to process.
    */
   protected function importConfig($collection, $op, $name) {
-    $config = $this->configManager->createConfigObject($name, $collection);
+    // Allow config factory overriders to use a custom configuration object if
+    // they are responsible for the collection.
+    $overrider = $this->configManager->getConfigCollectionInfo()->getOverrideService($collection);
+    if ($overrider) {
+      $config = $overrider->createConfigObject($name, $collection);
+    }
+    else {
+      $config = new Config($name, $this->storageComparer->getTargetStorage($collection), $this->eventDispatcher, $this->typedConfigManager);
+    }
     if ($op == 'delete') {
       $config->delete();
     }
diff -u b/core/lib/Drupal/Core/Config/ConfigInstaller.php b/core/lib/Drupal/Core/Config/ConfigInstaller.php
--- b/core/lib/Drupal/Core/Config/ConfigInstaller.php
+++ b/core/lib/Drupal/Core/Config/ConfigInstaller.php
@@ -183,7 +183,15 @@
     $config_to_install = array_diff($config_to_install, $this->getActiveStorage($collection)->listAll());
 
     foreach ($config_to_install as $name) {
-      $new_config = $this->configManager->createConfigObject($name, $collection);
+      // Allow config factory overriders to use a custom configuration object if
+      // they are responsible for the collection.
+      $overrider = $this->configManager->getConfigCollectionInfo()->getOverrideService($collection);
+      if ($overrider) {
+        $new_config = $overrider->createConfigObject($name, $collection);
+      }
+      else {
+        $new_config = new Config($name, $this->getActiveStorage($collection), $this->eventDispatcher, $this->typedConfig);
+      }
       if ($data[$name] !== FALSE) {
         $new_config->setData($data[$name]);
       }
diff -u b/core/lib/Drupal/Core/Config/ConfigManager.php b/core/lib/Drupal/Core/Config/ConfigManager.php
--- b/core/lib/Drupal/Core/Config/ConfigManager.php
+++ b/core/lib/Drupal/Core/Config/ConfigManager.php
@@ -287,36 +287,2 @@
 
-  /**
-   * {$inheritdoc}
-   */
-  public function createConfigObject($name, $collection) {
-    $overrider = $this->getConfigCollectionInfo()->getOverrideService($collection);
-    if ($overrider) {
-      $config = $overrider->createConfigObject($name, $collection);
-    }
-    else {
-      $config = new Config($name, $this->getStorageCollection($collection), $this->eventDispatcher, $this->typedConfigManager);
-    }
-    return $config;
-  }
-
-  /**
-   * Gets the configuration storage that provides the active configuration.
-   *
-   * @param string $collection
-   *   The configuration collection.
-   *
-   * @return \Drupal\Core\Config\StorageInterface
-   *   The configuration storage for the provided collection.
-   */
-  protected function getStorageCollection($collection) {
-    if (!isset($this->storages[$collection])) {
-      if ($this->activeStorage->getCollectionName() == $collection) {
-        $this->storages[$collection] = $this->activeStorage;
-      }
-      else {
-        $this->storages[$collection] = $this->activeStorage->createCollection($collection);
-      }
-    }
-    return $this->storages[$collection];
-  }
 }
diff -u b/core/lib/Drupal/Core/Config/ConfigManagerInterface.php b/core/lib/Drupal/Core/Config/ConfigManagerInterface.php
--- b/core/lib/Drupal/Core/Config/ConfigManagerInterface.php
+++ b/core/lib/Drupal/Core/Config/ConfigManagerInterface.php
@@ -133,15 +133,2 @@
 
-  /**
-   * Creates a StorableConfigBase object according to the needs of the collection.
-   *
-   * @param string $name
-   *   The configuration object name.
-   * @param string $collection
-   *   The configuration collection.
-   *
-   * @return \Drupal\Core\Config\StorableConfigBase
-   *   The configuration object.
-   */
-  public function createConfigObject($name, $collection);
-
 }