We looked at and drove a 98 Outback a few weeks ago. It had the 2.5, at, and 143k miles on it. Very clean and nice car and at the price the dealer was going to let us have it at---$4300. We would have bought it but the previous owner didn't disclose some of the problems on it when they traded it and we decided to pass on it.
IIRC, the 2.2 was available only in 95 & 96, after that the 2.5 was standard issue.