what kind of turbo?
 

i am about to buy a 1987 supra rsr that has been heavily modified internally. it has about 325 to 350 horsepower and it keeps eating up stock turbos. the seller said if a go with a good ball bearing turbo i should be fine but i dont know anything at all about turbos and this will be my first turbo car so i need all the help i can get any help is appreciated. thanx guys.

the turbonetics ball bearing turbo could be a good replacement
but the best turbo out right now is greddy's
you can look at t3/t4 turbos from greddy
you might wanna ask a shop or sumbody that knows more about turbos
so you will know what size exactly you need to get