how do you get the exhaust to sound like this?

SOUTHZZ

Most of the "sound" you are hearing(and wanting)has to do with the specific
engine/car.Porsche's in general have a common sound as does the Z cars
with the VQ engine.In addition,you have a shorter exhaust system in a mid engined
car.You don't get the low bass tones.You can mod your Z with test pipes or HFC's
to get more feedback when you let off the gas.Its not gonna be the same.
Or,you can get an electronic device that selects exhaust sounds lol.