is this possible?
 

a friend of mine has a 91 mk3 supra with a 2jz twin turbo and a six speed trans apparently the car came stock that way is that possible?

No. The 2JZ wasn't introduced until the 1993 model year and in the MkIV Supra, same-same the 6-speed transmission (Getrag V160 I think). Someone swapped them in at some point from a donor MkIV.

Nice setup, but not stock to a MkIII of any year.

thats what i thought but all of the emblems including the ones in the taillights say 3.0 twin turbo. did toyota make any other 3 liter twin turbo motor in that era or could it be a 1 off concept?

You can get various emblems, badges, and logo's for just about anything, and some people like to put them on their cars whether they're legit or not (Posers I think they used to be called).

And of course since the MkIV 2JZ was a 3.0 liter twin turbo engine, the emblem/badge you're referring to could well have come from the same place the engine and transmission did and just been worked onto the car. After all, if you went to the trouble of retrofitting that engine and transmission into your MkIII, wouldn't you want to show off a little? :D

well hes selling it for 2200 but it needs a clutch and intercooler mounts is that worth it and how much is somthing like this worth in driving condition

MKIV was 1993.5 actually. There was a 1993 MKIII Supra; Just not in North America or European markets.

True value for a Supra depends greatly on exactly what kind of condition it's really in (as opposed to what condition it just looks like it's in), so I don't like to offer estimates. So I'd have to say it's worth whatever someone is willing to give him for it.

MKIV was 1993.5 actually. There was a 1993 MKIII Supra; Just not in North America or European markets.

Thanks Cre, didn't realize that the MkIII carried over a little elsewhere.

Yeah, the Supra is a half-year car for every generation, IIRC. The MKIII started half into the 1986 model year... 1986.5 to be precise. Part of it also stems from the differences in what defines "model year" in any given market. In the US a car made between October of 1986 to September of 1987 is considered a 1987.