Welcome mate, search the forums, there's a few '08- onwards WRX's on here, so there's plenty of info from people that have done it already.
Just make sure you go to a reputable workshop for mods/ servicing and you'll be right.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i