Have you kept your Exhaust stock? Im not sure if I should put a Corsa sport or Extream or keep it stock? Im GWE and waiting and really dont have a clue as to the Exhaust sound stock or not. Ive listen to some of videos but still not sure? The corsa exhaust is able to be purchased right now for $1350. So it makes me want to jump on it. Any feed back would be great. Thanks AK907