Reddit reviews Gates TCKWP328A Engine Timing Belt Kit with Water Pump

Here's part 1 of meaty's 5 part guide. It covers the DOHC, which is the type of engine you have and slightly more complicated that the SOHC.

As for parts, here's the belt kit you'd need. If you have access to basic tools (wrenches, ratchets) you should be ok. You will need a 22 mm deep impact socket and a breaker bar to get the harmonic balancer pulley off, but you may be able to rent these from a place like AutoZone. Also, you'll need some new coolant since you'll have to drain the old to change out the water pump.

Its not too hard. Just time consuming. Be patient and follow all the steps. This diagram shows you how to line the cam wheels up. Its sucks to do it, but once you do, you're good for another 100,000 miles and you'll save hundreds of dollars doing it yourself.

Sure, here you go: http://www.amazon.com/gp/product/B0033DH9SC/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

I found amazon has the best price. The Gates kit is extremely popular and comes with a timing belt, hydraulic tensioner, 4 idler pulleys, and a water pump with gaskets. With the exception of the Mishimoto bits, the rest of the maintenance items I listed earlier were Subaru OEM.

I just had one of the Mishimoto hoses spring a leak on me actually :(