Thank God there is someone who is finally telling it like it is with regard to the used M5 market. I too have been looking for an unmolested E34 M5 and am sick and tired of the outrageous expectations sellers are throwing out there hoping to land the "big one". Most of the cars I have seen are far from being well cared for or are "incomplete" cars as far as I'm concerned. Being from Canada, many end up in the U.S. through EBAy in pursuit of the American dollar. Do yourself a favor rather than pay these creeps all this money, put the money toward a new M5! If you can find an idiot to pay you $9000 for a 91'M5 with a bad motor hurry up and do the deal before he blinks - because anyone with an ounce of sense would not give you that kind of money for that car -especially with all of the tacky aftermarket crap you did to it(the playstation is very juvenile). I purchaed a 1991 M5 in mint condition 9 months ago as a 1 owner, 105,000 documented miles, no mods, dealer only service and only paid $14,000! Which was still over Kelly Blue Book - and we all know Kelly Blue Book is very high compared to real world prices - There are tons of people that try to sell M cars for a mint - the never ever sell - If you had a 91' M5 with 132,000 miles (average for a 91')if it is in excellent condition and you were selling to an individual high book would be about $11,900 (a lot less for a dealer trade). A new motor will not increase the value of your car beyond high book plus a low mileage add. You will probally be better off fixing your current motor, then put the car back to stock and get what you can out of it.