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You should change the water pump when changing the timing belt for convenience. Subaru recommended timing belt change interval at 105k miles. Here a link for DIY: http://www.iwsti.com/forums/how-install/154977-04-sti-timing-belt-change.html I wouldn't recommend DIY for noob since the work is quite extensive. I just let it to the pro for my timing belt change, although I didn't change my water pump at the time for the lack of money.

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15y ago

What else can I help you with?