I just swapped my 07 2.5i this spring, it was pretty easy maybe a few more steps than pulling the engine. The time consuming part is finding all the parts since I did not have a donor. I used a $300 2013 forester 5mt and clutch/flywheel. 2012 wrx pedals, shifter and trans h crossmember mount. legacy gt 5mt driveshaft and LSD differential and rear axles. Front axles between 4eat and 5mt are the same not sure about 5eat. You'll need to look at part diagrams to figure out what bolt hardware you will need such as flywheel bolts etc. Check Craigslist, eBay and car-part.com as well as the partout classifieds here for parts. Most components are interchangeable between 08-12 wrx, impreza. And 09-13 forester besides the cross member. You will also need a tactrix cable to flash the manual ROM to your auto ecu. There's like 3 or 4 wires you need to modify if you don't want to spend the time and money on a manual harness.