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The following section contains information from a previous version of StarCraft II which is no longer valid.
Missile turrets used to rely on sensor towers and radar towers to detect enemy units. However, by the GDC 2008 build they could detect by themselves. By May 21st, 2009 they had lost their detection ability again. Missile turrets were detectors again at the start of the StarCraft II beta.
Visually, missile turrets only underwent a few updates in regards to their StarCraft predecessors. After a few art revisions the missile turret was done finally and wasn't revisited again until the end of development. However, when the armory in Wings of Liberty was finalizing the upgrade changes of the artwork, the missile turret was picked for a visual upgrade. The titanium housing upgrade simply added more chunky armor bits to the existing turret, but with a newer texture pass.
During the Legacy of the Void beta, missile turrets lost the engineering bay requirement for their construction. This was reinstated, as the developers felt that the change didn't spark a change in strategy, and that "the choice to just build Turrets easily didn’t feel like a good add to the game."
The upgrade was available in the multiplayer game as of May 2009.