“Caveat emptor" is always the first rule of buying a used car, even with a CLEAN title. What were you thinking buying a car with a salvage title sight unseen (and putting down such a large deposit in the first place)? You should have posted here for advice BEFORE you did it.
2007 BMW 335i Sedan, 6MT, ZSP
2004 BMW M3 Coupe, 6MT