How to tell the difference between a WRX & STI (GC chassis)

What's the difference between a plain old Subaru WRX (Impreza turbo) and the hyper version STI? In this vid we take a look at some the key differences which make them easier to tell apart. I'm only covering the GC8/GF8 chassis to start with. I'll do more videos for the GD chassis onwards.
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