Eurotrash V12: 1993 BMW M5, S70B56 conversion

So you want a classic sports sedan - nay, THE classic sports sedan - but six cylinders just isn't enough. OK, how about a V8 swap? The S62 made 400hp in its original home, the E39 M5. No? How about the crazy shrieking S85 V10? Surely 500hp of "F1-inspired" goojum will get your mojo workin'. The E60 M5 donor car can be put out of its misery (it's a mercy kill). NO? For Füchs' sake then; if you like it (cylinder count madness, that is) then you better put a V12 in it.  Find this 1993 BMW M5 with S70B56 V12 Swap for sale in Rochester, NY for $16,500 via craigslist. Tip from JayKav.

V12 6spd Convert: 1995 BMW E34 550i

The E34 generation BMW 5-series (1988-1996) sits in the happy depreciated valley that all luxury sedans hit after the narcotizing new car smell is gone and the bills start to pile up.  However, this simply means that ownership transfers to a dedicated group of enthusiasts that consists of die-hard model fanboys, older folks who remember a time when stuff lasted for years, and speed junkies who modify anything that moves...this was owned by the latter.  Find this 1995 BMW E34 550i V12 6-Speed offered for $7,999 in Burlington, KY via craigslist.  Tip from Mrkwong.