IMO, no Jap Import Classic Impreza has a bulletproof engine as standard, there are so many variables which can reduce engine life.. best bet is to try and get a fresh import as standard as possible so that you know its not been fiddled with. Dump Valves, De-Cats, Boost Controllers, Induction Kits are a few things that can go some way to screwing bits of your engine up......... so its a wee bit of a minefield. However, scoobs are good cars mate, but then you're in the right place for an opinion like that...
Cheers,
Grant