Lukey, I don't know much about your exact situation, but from what I can see, it appears the fault was caused from installation. Either way, if i paid 4-5k for an engine and it went the next day from 1 boost spike and pissing oil everywhere, I would be complaining pretty loudly.

Im sure u are doing everything you can to get it fixed under some sort of warranty, surely its not "your" fault.