just wondering if all garett t/03 turbos have the same flange. I know of some in cars at junkyards and was thinking of pulling one out just for fun and maybe rebuilding it and putting it on the rex.

 

the t3 turbo is smaller then the stock one... I am pretty certain that it flows less if I am wrong someone please let me know however.

And as for simply putting a turbo on a car. especially if it is na you have ALOT of work... you will need to get a fuel controller,
boost guage,
intercooler (not required but prefered)
blow off valve
mistlanious fittings, and modifications, and fabrications to allow it to work. even then depending on the millage of your seven and the maintenance history the engine may not last long under boost.
Not worth it in my opinion,
Also as you are new on the forum there is a search button on the top right hand corner of the screen you can search for similar topics as they have been convered about 100 times. Not flaming your simply informing.
Welcome to the forum!