Agree that it doesn't sound like a subaru. We had a v8 wrx v ltd and it didn't have that subaru rumble. We have now got the v10 st and have the rumble back again.
Overall though we loved the v8, we found it good value for money, good pickup and driving ability. The only fault we had (and no of others with v8 with the same problem is the shocks knocking. It has also been advised to us (by subaru mechanic and others) that the knocking does not cause a problem or dmage its just annoying. Turn stereo up and it eleviates it lol.