Long story short: my friend bought a 2007 Legacy GT with ~91k and after 1000 miles his turbo grenaded (shaft broke). We pulled the turbo and it's a VF46. However there's conflicting information as to whether or not this is the stock turbo (some people have said that it came stock with a VF40). Essentially we're trying to figure out if his car has been tampered with/replaced previously.
He's also concerned that the turbo may have been oil starved which caused it to blow and I was wondering if there's any way to really determine that or whether or not there might be any other reason why his turbo blew other than bad timing on the purchase? I'm a duramax diesel guy and haven't ever really worked on the boxer engines before so I'm a little lost when it comes to them and am trying to learn as well.
I've seen the thread on turbo replacement options but that doesn't really help in his situation since he's really just looking for a good drop in replacement (whether that's just a VF46) or something just over stock that doesn't require any further modification; so I was wondering what brands/models might be the best for his situation? There's a lot of conflicting information on this as well so I'd appreciate if someone might be able to push him in the right direction.
Hotside pic for attention lol