if i buy i non turbo toyota supra can i change the engine to a twin turbo???

Yes, you can add aftermarket turbos. I don't know that much about the Supra specifically so I can't tell you where to look to get one, but a turbo is not something that needs to come with the engine.

yes, and you can buy a 2jz engine from japan for a good price, and just pop it in there you might need more than the engine, but the good thing about supras is non turbo or turbo or twin turbo, the engine bay doesn't change so all you need to do is mount everything like it was mounted from the factory, but its not like you have to totally customize everything to make it fit. Because it was already built to fit all of the stuff you need.

yes you can. just purchase an 2jzgtte engine from japan and put it right into the non turbo car. i would suggest a entire front clip since the harness and all parts are included with the engine and tranny. it would be a bit pricy tho, but its up to u, if u can get the non turbo for cheap enough and put in ur own JDM engine, u would pay less for the car. plus if u put an JDM engine in, u will have a JDM engine and if u wanted to you can convert it to right hand drive with the purchase of a front clip.

no you dont have to buy a new block. do a rebuilt with low compression pistons,because turbos up your compression and youll be blowing headgaskets.after this you can install the twin turbo kit safely.

You can but it's alot of $$$ and time wasted on something you should have known about the first time. It's always best to choose something you're absolutely sure about from the beginning.

yes you can, but i would recommend buying one with a twin turbo engine and save your money for futher modifications.

yes but they are two different engines. you would have to buy a new block and everything

you can put a jet engine in a VW. All it takes is knowledge and money.