99 9-5 is T7, 99 *9-3* was T5
The turbo is the craptastic GT17... if its original and has more than 75k, Garrett would probably like it back to see what went 'wrong'
You would not want to swap the trans, especially being able to sell it for a profit, take your profit and buy what you want!
Maptun has some Stg 4 9-5 Autos. Flush that fluid every year.
If you change your mind... I'd buy it... I've got a lonely B234